Attack bishop, after all the rest (5)
I believe the answer is:
blast
'attack' is the definition.
(I know that attack can be written as blast)
'bishop after all the rest' is the wordplay.
'bishop' becomes 'B' (chess abbreviation).
'after all the rest' becomes 'last' (last means coming after all the rest).
'b'+'last'='BLAST'
(Other definitions for blast that I've seen before include "Severely criticise" , "Loud noise from a horn" , "Sudden, strong current of air" , "Effect of explosion" , "Explosion - mild oath" .)