Sushi roll garnish (3)
I believe the answer is:
roe
'sushi roll garnish' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for roe that I've seen before include "A mass of fish-eggs" , "Mass of fish's eggs" , "shy animal" , "Hoofed animal(s)" , "Lobster's ripe ovary" .)