Crossword Genius

British crowd returned device for detonation (4)

Ross

I believe the answer is:

bomb

'device for detonation' is the definition.
(bombs are detonated)

'british crowd returned' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'crowd' becomes 'mob' (mob is a kind of crowd).
'returned' is a reversal indicator.
'b'+'mob'='bmob'
'bmob' reversed gives 'BOMB'.

(Other definitions for bomb that I've seen before include "Drop" , "worn-out car" , "One set off" , "One going off" , "Flop - load of money" .)

I've seen this clue in The Sun and The Times.
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