Proposal overcame initially reluctant girl (4)
I believe the answer is:
bird
'girl' is the definition.
(bird is a kind of girl)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for bird that I've seen before include "Creature - time in prison" , "Feathered animal" , "Booby, for example" , "Fowl" , "Feathered creature" .)