Grab wild crow (4)
I believe the answer is:
brag
'crow' is the definition.
(I know that crow can be written as brag)
'grab wild' is the wordplay.
'wild' indicates anagramming the letters.
'grab' with letters rearranged gives 'BRAG'.
(Other definitions for brag that I've seen before include "Show off, crow" , "Shoot a line" , "Idle talk" , "popular with 15 [EGOTIST] , no doubt" , "game of bluff" .)