Prey seen where stone is excavated (6)
I believe the answer is:
quarry
I believe this is a double definition.
'prey' is the first definition.
('quarry' can be a synonym of 'prey')
'where stone is excavated' is the second definition.
'seen' is the link.
(Other definitions for quarry that I've seen before include "Surface excavation" , "blasted site" , "Dig out" , "what one seeks ..." , "Hunted animal - excavation" .)