Garibaldi biscuit enthrals bird (4)
I believe the answer is:
ibis
'bird' is the definition.
(ibis is a kind of bird)
'garibaldi biscuit enthrals' is the wordplay.
'enthrals' says the answer is hidden in the clue (hidden letters are captured or enthralled).
'IBIS' can be found hidden inside 'garibaldi biscuit'.
(Other definitions for ibis that I've seen before include "sacred creature of Egypt" , "Eastern" , "Large wader" , "Sacred Egyptian bird" , "Glossy wading bird" .)