Pines away for bird (5)
I believe the answer is:
snipe
'bird' is the definition.
(snipe is a kind of bird)
'pines away' is the wordplay.
'away' is an anagram indicator (letters move away from their original places).
'pines' anagrammed gives 'SNIPE'.
'for' is the link.
(Other definitions for snipe that I've seen before include "Fire from cover; bird" , "Wading bird; shoot from concealment" , "river bird" , "Shoot from place of concealment" , "Criticise" .)