A black and white bird (6)
I believe the answer is:
magpie
'a black and white bird' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for magpie that I've seen before include "Part of target" , "Ominous bird if seen alone" , "Long-tailed crow" , "Black and white member of crow family" , "chatty bird" .)