Times 25925 - in which I bomb

Solving time : After about 11 minutes, all I had left to put in was 14 across. And nothing at all came. For almost 10 minutes - I could see SPEED and SPIED and OPTED fitting the space there, but couldn't justify one over the other for the answer. Eventually I figured SPEED would be the best option, and that I guess "bomb" could mean to move fast. Fingers crossed I put it in and find...

1 incorrect!

Damn it - does this mean it wasn't SPEED?

Of course it is - I've got a very silly typo at 25 across where somehow A has crept in to make it AMBIANCE instead of AMBIENCE.

Nice try, idiot.

Away we go...

Across
1	DISSONANCE: IS,SON in DANCE
6	ICE,D: two abbreviations for diamonds - the setter can also use this wordplay for DICE or DICED
8	PLEONASM: anagram of ON,ALPS,ME - another word for redundancy
9	IMPEDE: 1 then MEDE (Medean) containing P
10	EMIT: hidden in thEM I Take
11	MINNESOTAN: ME,SOT containing INN, then AN
12	SOLIPSIST: SO,LIT containing (SIPS)*
14	SPEED: P in SEED(start) - quick post-solve peek at Chambers, yep, "bomb" can mean to drive fast
17	DRONE: R in DONE
19	ON(further),SLAUGHT(er)
22	MICRONESIA: anagram of (RAIN,COMES) containing I
23	H,AIR
24	STYMIE: M1 in STYE
25	AMBIENCE: take VAL out of AMBIVALENCE and you get my downfall today
26	(h)ERO,S
27	ENDEARMENT: DEAR,MEN in ENT
Down
1	DEPRESSED: DEED containing PRESS
2	SPECIAL: PE(training),CIA(agents) in S(awmil)L
3	NEAR MISS: Take the first letters away from oNE wARM kISS
4	NO MAN IS AN ISLAND: NO MAN'S LAND surrounding (SINAI)*
5	E,XI,LED
6	IMPROMPTU: I'M PROMPT then sounds like YOU
7	ENDGAME: DG(Director-General of the BBC) in E-NAME, and "time" is part of the definition
13	IGNORAMUS: (ORGANISM)* surrounding U
15	DETERGENT: EGRET reversed in DENT
16	ALHAMBRA: A LAMB(innocent), RA containing H
18	ROISTER: I for O in ROOSTER
20	G(angste)R,ANNIE
21	ANNEXE: sounds like AN X