Bird found in very large quarry (6)
I believe the answer is:
osprey
'bird' is the definition.
(I know that osprey is a type of hawk)
'very large quarry' is the wordplay.
'very large' becomes 'os' (abbreviation for oversize).
'quarry' becomes 'prey' (synonyms).
'os'+'prey'='OSPREY'
'found in' is the link.
(Other definitions for osprey that I've seen before include "Large bird preying on fish in inland waters" , "Flier" , "One flying" , "Large fish-eating bird of prey" , "Fish-eating raptor" .)