Salted roe (7)
I believe the answer is:
caviare
'salted roe' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for caviare that I've seen before include "Sturgeon roe" , "Avarice (anag)" , "Expensive delicacy" , "Sturgeon's roe" , "eggs that can be expensive" .)