StarKist fish (4)
I believe the answer is:
tuna
'starkist fish' 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 "Fish, often tinned" , "Skipjack --, blue-fin --" , "Fish sold in cans" , "Popular food fish" , "Sea creature" .)