Blows up generals in explosion (8)
I believe the answer is:
enlarges
'blows up' is the definition.
('enlarge' can be a synonym of 'blow up')
'generals in explosion' is the wordplay.
'in explosion' indicates anagramming the letters (I've seen this in other clues).
'generals' with letters rearranged gives 'ENLARGES'.
(Other definitions for enlarges that I've seen before include "Generals (anag.)" , "Widens" .)