Incline to release large bird (3)
I believe the answer is:
tit
'bird' is the definition.
(tit is a kind of bird)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for tit that I've seen before include "Small songbird" , "Small garden bird" , "Boob made backing" , "18's [BIRD]" , "What you swap for tat" .)