Bluster about wrangle (4)
I believe the answer is:
crow
'bluster' is the definition.
(crowing is a kind of blustering)
'about wrangle' is the wordplay.
'about' becomes 'c' (abbreviation for 'circa'**).
'wrangle' becomes 'row' ('row' can be a synonym of 'wrangle').
'c'+'row'='CROW'
(Other definitions for crow that I've seen before include "Blow one's own trumpet" , "Boast, swagger, triumph" , "Bird in 1's poems" , "bar" , "One commonly stoned" .)