Crossword Genius

Attack includes small explosion (7)

Ross

I believe the answer is:

blowout

'explosion' is the definition.
(thesaurus)

'attack includes small' is the wordplay.
'attack' becomes 'bout' (I've seen this before**).
'includes' is an insertion indicator.
'small' becomes 'low' ('low' can be a synonym of 'small').
'bout' going around 'low' is 'BLOWOUT'.

(Other definitions for blowout that I've seen before include "lot to eat" , "Car's exploding tyre incident" , "Heavy meal" , "Lavish meal (slang)" , "large meal" .)

I've seen this clue in The Independent.
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