Tobiko or ikura (3)
I believe the answer is:
roe
'tobiko or ikura' 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 "If hard, eggs" , "Hoofed animal(s)" , "Caviar" , "Swift runner" , "A mass of fish-eggs" .)