Caviar fish (4)
'caviar fish' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sturgeon that I've seen before include "Source of caviare and isinglass" , "Source of caviar" , "Large fish, valued for its roe" , "Caviar supplier" , "Fish sought for caviar" .)
'caviar fish' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for shad that I've seen before include "fish that's been caught" , "Fish; dash (anag.)" , "Fish related to the herring" , "Herring-like fish" .)