Prisoner has stick brought back for bird (6)
I believe the answer is:
condor
'bird' is the definition.
(condor is a kind of bird)
'prisoner has stick brought back' is the wordplay.
'prisoner' becomes 'con' (abbreviation for 'convict').
'has' means one lot of letters go next to another.
'stick' becomes 'rod' (I've seen this before).
'brought back' says the letters should be written backwards.
'rod' back-to-front is 'dor'.
'con'+'dor'='CONDOR'
'for' is the link.
(Other definitions for condor that I've seen before include "Large bird of the Andes (national symbol of Peru)" , "Large American vulture" , "Large vulture of S America" , "South American vulture" , "Largest New World vulture" .)