Magpie cousin (4)
I believe the answer is:
crow
'magpie cousin' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for crow that I've seen before include "one often getting stoned!" , "Make sounds of pleasure as a baby does - or a bird" , "One joins others in a murder" , "Blow one's own trumpet" , "Brave" .)