Bird in a large quarry (6)
I believe the answer is:
osprey
'bird' is the definition.
(osprey is a kind of bird)
'large quarry' is the wordplay.
'large' becomes 'os' (abbreviation for oversize).
'quarry' becomes 'prey' (synonyms).
'os'+'prey'='OSPREY'
'in a' is the link.
(Other definitions for osprey that I've seen before include "A feather trimming (6)" , "Lakeland bird" , "Bird from an outsize victim" , "Fish-eater" , "I grab fish" .)