Red-breasted songbird (5)
I believe the answer is:
robin
'red-breasted songbird' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for robin that I've seen before include "Red-breasted songbird" , "Bird; Batman's aide" , "Hood, possibly" , "good fellow in the D [DREAM]" , "Small brown thrush" .)