Bird taking piece of garibaldi biscuit (4)
I believe the answer is:
ibis
'bird' is the definition.
(I know that ibis is a type of wader)
'piece of garibaldi biscuit' is the wordplay.
'piece of' indicates the answer is hidden within the clue.
'IBIS' can be found hidden inside 'garibaldi biscuit'.
'taking' is the link.
(Other definitions for ibis that I've seen before include "Wading bird with a down-curved bill" , "Flier" , "Bird sacred in Ancient Egypt" , "Long-legged wading bird" , "Retreat" .)