Sushi garnish (3)
I believe the answer is:
roe
'sushi 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 "Mass of fish's eggs" , "Lobster's ripe ovary" , "shy animal" , "Hoofed animal(s)" , "eg Caviare" .)