Brightly coloured bunting with a distinctive song (12)
I believe the answer is:
yellowhammer
(Other definitions for yellowhammer that I've seen before include "Species of European bunting" , "European bird - Orwell mayhem (anag)" , "Common European bunting" , "Bird of the bunting family" , "Bird with a call supposed to sound like "a little bit of bread and no cheese"" .)