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