Attack, capturing large crow (5)
I believe the answer is:
gloat
'crow' is the definition.
(I've seen this before)
'attack capturing large' is the wordplay.
'attack' becomes 'goat' (go at).
'capturing' indicates putting letters inside.
'large' becomes 'l'.
'goat' placed around 'l' is 'GLOAT'.
(Other definitions for gloat that I've seen before include "Dwell on with self-satisfaction" , "Smugly look on another's misfortune" , "Exult over one's good fortune" , "Be smug about one's success" , "Express triumphant self-satisfaction" .)