Large victim of predatory bird (6)
I believe the answer is:
osprey
'predatory bird' is the definition.
(I've seen this before)
'large victim' is the wordplay.
'large' becomes 'os'.
'victim' becomes 'prey' (prey is a kind of victim).
'os'+'prey'='OSPREY'
'of' is the link.
(Other definitions for osprey that I've seen before include "Fish-eating hawk" , "Large bird that preys on fish in inland waters" , "Marine bird of prey" , "Flier" , "Lakeland bird" .)