Attack includes small explosion (7)
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" .)