Speedy attack capturing pawn (5)
I believe the answer is:
rapid
'speedy' is the definition.
(I know that speedy can be written as rapid)
'attack capturing pawn' is the wordplay.
'attack' becomes 'raid' (raiding is a kind of attacking).
'capturing' is an insertion indicator.
'pawn' becomes 'p'.
'raid' going around 'p' is 'RAPID'.
(Other definitions for rapid that I've seen before include "Flying" , "Happening at great speed" , "Quick or swift" , "Speedy, quick" , "Waterway where the current runs very fast" .)