Across:
1. Concerned with non-drinker taking the piss in 18 down content passed on (7)
5. Reminders of ongoing trauma, mostly about thrashing (7)
9. Can reverse, for example, overindulgence (5)
10. Web of Life on Earth, comfortable root (9)
11. Shake alien spacecraft (6)
12. What's said before "alive" or "dead" by giant? (Atlas or Hercules perhaps, definitely a big one!) (8)
14. He's straight away getting rid of polar opposites seen together, keeping the others with some reluctance? (10)
16. American bird (4)
18. Role-reversal gig (4)
19. Playful film with Jodie Foster, in general directing a particular way (10)
22. Hearts in diamonds in 500 appearing later for those without faith (8)
23. Able to run here in Italy when wearing cap (6)
26. Let no race be abused by this principle? (9)
27. Lump in the throat with a love briefly turning back (5)
28. Took stock of degraded metal on electric light (7)
29. Cut down importing uranium, given source of energy (7)
Down:
1,20. Finally, engineer to grab 17 for 11, though doing so 23-29, a pioneer indeed! (6 1 7)
2. In retro music, 'I' note? (5)
3. Fellows cast in molten steel, iron and 6 perhaps (8)
4. Pines perhaps to lose last of beginner supports (4)
5. It drives users to restrict cable length in factory (10)
6. After China's year to 12/2/1926, finally drawing in Japanese money - it was used in 23 form in 1 20's 11 of 16/3/1926 (6)
7. Group in depot pour richer mixture (9)
8. One way or another, therefore, expressions of Lisa's indifference and Bart's pain (7)
13. Relieved of load in bed, run nude all around (10)
15. Takes to task, arresting a pair of fellows for the gallows perhaps (9)
17. What Icarus got wrong with mental approach the first time, becoming fatal ultimately (8)
18. Nitwit terminally got hold of it, and now it's labelled 'X' (7)
20. see 1 down
21. Favourite job? Mostly being 5 down in 1 20's 11 of 16/3/1926! (6)
24. Customary victory eluding unfortunate 27s (5)
25. Part of tree often eaten in insect's cycle (4)
Solution:
RETWEET=PROMPTS|
O=O=L=E=R=X=O=O|
BINGE=ECOSYSTEM|
E=I=M=S=P=G=P=E|
ROCKET=BEHEMOTH|
T===N=U=L=N=U=O|
HESITANTLY=CROW|
==C=S=B=A=A=R==|
TRAP=FUNNELLING|
W=F=P=R=T=T===O|
INFIELDS=LIQUID|
T=O=T=E=L=T=S=D|
TOLERANCE=UVULA|
E=D=O=E=A=D=A=R|
RUSTLED=FUELLED|
Name: 894 - Alien Craft
Author: by BenDR

Annos-Across:
1. RE + T( WEE )T
5. P(ROMP)TS(d)
9. BIN + rev(EG)
10. E + COSY + STEM
11. ROCK + ET
12. BE HE + MOTH
14. HE'S + I(ns)TANTLY
16. dd
18. rev(PART)
19. FUN + NELL + IN + G
22. INFIDELS with D delayed
23. QUI in LID
26. *(LET NO RACE) , ext def
27. rev( A LUV U )
28. RUST + LED
29. U in FELLED
Annos-Down:
1,20. tails &lit
2. rev tel musi(C I NOT)e < , &lit
3. MEN in *STEEL
4. T(r)EES
5. P( ROPE L )LANT
6. OX + Y( G )EN
7. tel (de)POT POUR RI(cher)
8. SO + MEH + OW
13. *(BED RUN NUDE)
15. SC(A FF)OLDS
17. A(t->L)TITUDE - first 'T' becomes (fata)L
18. tel (ni)TWIT TER(minally)
21. PET + ROL(e)
24. *(U(v)ULAS)
25. cyc(FLEA)
Defs-Across:
1. 18 down content passed on
5. Reminders
9. overindulgence
10. Web of Life
11. spacecraft
12. definitely a big one
14. with some reluctance
16. American
16. bird
18. gig
19. directing a particular way
23. Able to run
26. this principle
28. Took stock
29. given source of energy
Defs-Down:
1,20. Finally, engineer to grab 17 for 11, though doing so 23-29, a pioneer indeed!
2. In retro music, 'I' note
3. iron and 6 perhaps
4. supports
5. It drives users
6. it was used in 23 form in 1 20's 11 of 16/3/1926
7. mixture
8. One way or another
13. Relieved of load
15. the gallows perhaps
17. What Icarus got wrong
18. now it's labelled 'X'
21. 5 down in 1 20's 11 of 16/3/1926
24. Customary
25. Part of tree often eaten