Getting the bird, he finishes crestfallen (3)
I believe the answer is:
hen
'getting the bird he finishes crestfallen' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'getting the bird he' is the wordplay.
'getting' says to put letters next to each other.
'the bird' becomes 'n' (I am not sure about this - if you are sure you should believe this answer much more).
'n' after 'he' is 'HEN'.
Can you help me to learn more?
(Other definitions for hen that I've seen before include "Composed of women" , "Adult female chicken" , "Female lobster, fowl" , "Coop resident" , "Farm bird" .)