Bird dressin'? (5)
I believe the answer is:
robin
I believe this is a double definition.
'bird' is the first definition.
(robin is a kind of bird)
'dressin'?' is the second definition.
('robing' pronounced like 'dressing' was; robing is a kind of dressing)
(Other definitions for robin that I've seen before include "Small songbird" , "Famous outlaw" , "Bird, killed by Sparrow" , "Christmas-card bird" , "Bird; Batman's aide" .)