Baltimore slugger (6)
I believe the answer is:
oriole
'baltimore slugger' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for oriole that I've seen before include "Oil ore, strangely, for the songbird" , "Baseball player in Baltimore" , "Golden-yellow bird" , "Bright-plumaged bird" , "Black and yellow US bird" .)