StarKist product (4)
I believe the answer is:
tuna
'starkist product' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tuna that I've seen before include "Large fish for the strange aunt" , "Fish, often tinned" , "(Meat of) large fish" , "swimmer" , "Fish sold in cans" .)