Sturgeon's eggs (3)
I believe the answer is:
roe
'sturgeon's eggs' 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 "Part of fish, sounds like go through water" , "Mass of fish eggs" , "Caviar" , "Hoofed animal(s)" , "A mass of fish-eggs" .)