Salted roe of sturgeon (6)
I believe the answer is:
caviar
'salted roe of sturgeon' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for caviar that I've seen before include "Expensive roe" , "Sturgeon eggs" , "Fish roe" , "... prized delicacy" , "Sturgeon's roe" .)