Niçoise salad need (4)
I believe the answer is:
tuna
'nicoise salad need' 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 salt water fish" , "Yellow-finned fish" , "Popular food fish" , "Widely-eaten fish" , "Marine food for your strange aunt" .)