Crow in strange garb (4)
I believe the answer is:
brag
'crow' is the definition.
(I know that crow can be written as brag)
'strange garb' is the wordplay.
'strange' is an anagram indicator.
'garb' with letters rearranged gives 'BRAG'.
'in' is the link.
(Other definitions for brag that I've seen before include "Show off, crow" , "popular with 15 [EGOTIST] , no doubt" , "Blow one's own trumpet" , "game of bluff" , "game, making > boast" .)