Across:
1. Vehicle containing rocket perhaps, and a desktop computer part (11)
7. Something of value, as lost in group (3)
9,24dn. Something 14's final mission was going to study in Perth back alley, with Caledonian taking me (6'1 5)
10. Parent vehicle a highlight (7)
11. Foreign aces rival Cleveland players (9)
12. Curry often seen at court, 7 across out before public hearing starts (5)
13. Heading west as an organisation pushing frontiers (4)
14. Check everything, with unusually green passengers on board this 18 down's last mission, including a "8 down in 7 down" (10)
18. Second and fifteenth maybe confuse way of riding (10)
19. Be bad back (4)
22. After carbohydrate, this relative would get nasty cluster of boils (5)
24. Censured saint is finally free in country (9)
25. Part of 23 model's release price (7)
26. Popular present, possibly piercing (7)
27. 7 across off, but roughly cut short (3.)
28. They can help you cook meats and Indian breads with sequence of programs (11)
Down:
:1. American method: moving chain (7)
2. Broadcast 19 across (received by a sort of 7 across) before clipping of editor? (9)
3. Seven lying broken by having fair distribution (6)
4. Melted cheese in bed as requested (9)
5. Expert fliers conquering major heights (5)
6. Lady Spencer's bloom, as 14 met with in 1986 (8)
7,18dn. This 23 is second rate, getting close but then let loose (5 7)
8. Drink with celebrity influencer (7)
15. Soothing sounds of lies about party you finally accepted when returning (9)
16. Sliding, as arranged? (9)
17. Masses sorry to accept it's an insurance job (8)
18. see 7 down
20. Eternal Ness led astray (7)
21. Country imprisons union figure (6)
23. Company beginning with simple boat or ship? (5)
24. see 9 across
Solution:
MOTHERBOARD=SET|
O=E=V=E=C=I=P=E|
HALLEYS=MASCARA|
I=E=N=E=E=A=C=C|
CAVALIERS=STEPH|
A=I=Y=C===T===E|
NASA=CHALLENGER|
==E=A=E=U=R=L==|
SIDESADDLE=LIVE|
H===S===L=S=S=N|
UNCLE=CHASTISED|
T=R=S=O=B=A=A=L|
TRANSOM=INTENSE|
L=F=O=E=E=U=D=S|
EST=ROTISSERIES|
Name: 887 - Let Loose
Author: BenDR

Annos-Across:
1. MOT(HERB)O(A)R + D(esktop)
7. (as)SET
9,24dn. H + ALLEY + SCO(ME)T
10. MA'S CAR + A
11. *( ACES RIVAL )
12. *SET + P(ublic) H(earing)
13. rev( AS AN )
14. CH + ALL + *GREEN
18. S + IDES + ADDLE
19. rev( EVIL )
22. (carb)UNCLE
24. CHA( ST IS E )D
25. T + RANSOM
26. IN + TENSE
27. EST(imated)
28. ROTIS + SERIES
Annos-Down:
:1. MO + *CHAIN
2. *LIVE in *SET  + ED(itor) , &lit
3. t - (s)EVEN LY(ing)
4. *CHEESE in BED
5. AC(M)ES
6. DI'S ASTER
7,18dn. S PACE + SHUT  + *LET
8. TEA + CHER
15. L(U LLAB)IES
16. *(SLIDING AS) &lit
17. t - (m)ASSES SOR(ry)
20. *(NESS LED)
21. STAT(U)E
23. C + RAFT
Defs-Across:
1. computer part
7. group
9, 24d. Something 14's final mission was going to study
10. highlight
11. Cleveland players
12. Curry often seen at court
13. organisation pushing frontiers
14. passengers on board this 18 down's last mission, including a "8 down in 7 down"
18. way of riding
19. Be
22. relative
24. Censured
25. Part of 23
26. piercing
27. roughly cut short
28. They can help you cook meats
Defs-Down:
1. American
2. Broadcast 19 across (received by a sort of 7 across) before clipping of editor
3. having fair distribution
4. requested
5. heights
6. as 14 met with in 1986
7, 18. 23
8. influencer
15. Soothing sounds
16. Sliding, as arranged
17. it's an insurance job
20. Eternal
21. figure
23. ship