Across:
1. Not all liked Mondays in this U.S. town (6)
4. Destructive spree of someone unhinged, for instance a prime minister a king rejected? (7)
9. Infamous 27 6 of 1 across, 13 runs with one in artillery unit (8)
10. Called "The Front", it was set at the front (6)
11. Cite as mad invention that lets people shoot on the move (9)
12. Opens without opening animal yards (4)
13. Alright with city home, mostly a musical place (8)
16. Somewhere making advanced chips in cycle of AI demand (6)
17. Not forgiving Catholic about one time hounding saint (6)
18. Relaxed after Yule month quickly passed (8)
19. I know in France AI not used for 27 6's 8 24 (4)
20. Ghastly "Barron the Spoilt" (9)
23. Incorporated into origins of myth, Eden's devilish ground (6)
25. Asian gang bringing back racket in Caribbean island (8)
26. Reserved place finally, securing vehicle with space in the back for sleep (7)
27. Job fellow pursues ... particularly if he's a 12 down? (7)
Down:
1. Those enduring cycling for principle (5)
2. Those enduring fighting (not for principle) and lucky escapes involving near disaster (11)
3. Spirit of tragic Diana (5)
5. Chip placed under gold fruit, mostly for this type of transmission (9)
6. Slap a tiny bit? (3)
7. BBC's 27 6's adventures here are legend all over the place (9)
8. Using left (not hard), backhand played with ease finally - it's so clear! (5 3 5)
12. Lead character in Genesis, consumed with inclination, stamps his destiny? (11)
14. Like a little 24, the stink is awful around one (9)
15. In appearance, violating law or duty (9)
21. Short beast strangely hornier, showing no hesitation (5)
22. It may turn up on a royal at opening? (5)
24. It might enjoy a 6 and act strangely (3)
Solution:
=EDMOND=RAMPAGE|
=T=E=A=B=U=A=R=|
SHERRILL=TITLED|
=O=C=A=A=O===E=|
=STEADICAM=PENS|
===N===K=A=H=V=|
OKLAHOMA=TAIWAN|
=I=R=U=N=I=L=L=|
STRICT=DECEASED|
=T=E=W=W===T===|
JESS=ABHORRENT=|
=N===R=I=H=L=I=|
MINCED=TRINIDAD|
=S=A=L=E=N=S=R=|
SHUTEYE=POSTMAN|
Name: 916 - Mad Invention
Author: by BenDR

Annos-Across:
1. tel (lik)ED MOND(ays)
4. rev( E.G. A PM A R )
9. ( RR I ) in SHELL
10. T(he) + IT LED
11. *( CITE AS MAD )
12. (o)PENS
13. OK + LA + HOM(e) + A , dd
16. cyc( AI WANT )
17. ( I in RC ) + T , all after ST
18. EASED after DEC
19. JE S(ai)S
20. *( BARRON THE )
23. INC in acr( Myth Eden's Devilish )
25. rev( DIN ) in TRIAD
26. UTE in ( SHY + (plac)E )
27. POST + MAN , semi &lit
Annos-Down:
1. cyc( THOSE )
2. * NEAR in MERCIES
3. *DIANA
5. AU + TOMAT(o) + IC
6. tel (sla)P A T(iny) , &lit
7. *( ARE LEGEND )
8. B(L)ACK(h)AND + *WITH + (eas)E
12. PHIL (collins) ATE LIST
14. I in *( THE STINK )
15. *( LAW OR DUTY )
21. *( HORNI(er) )
22. rev( IT ) + A R + A(t) ,  &lit
24. *ACT
Defs-Across:
1. U.S. town
4. Destructive spree
9. Infamous 27 6 of 1 across, 13
10. Called
11. that lets people shoot on the move
12. animal yards
13. musical
13. place
16. Somewhere making advanced chips
17. Not forgiving
18. passed
19. 27 6's 8 24
20. Ghastly
23. ground
25. Caribbean island
26. sleep
27. Job fellow pursues ... particularly if he's a 12 down? (7)
Defs-Down:
1. principle
2. Those enduring fighting (not for principle)
3. Spirit
5. type of transmission
6. Slap a tiny bit? (3)
7. BBC's 27 6's adventures here
8. so clear
12. stamps his destiny?
14. Like a little 24
15. In appearance
21. Short beast
22. It may turn up on a royal at opening? (5)
24. It might enjoy a 6