Yellowfin or albacore (4)
I believe the answer is:
tuna
I believe this clue is a double definition.
'yellowfin' is the first definition.
(I've seen this in another clue)
'albacore' is the second definition.
(I've seen this in another clue)
(Other definitions for tuna that I've seen before include "Large salt water fish" , "Large food fish" , "Marine food for your strange aunt" , "A fish; sounds like piano juster" , "Bluefin, e.g." .)