Caviar reordered on reflection is more than needed (3)
I believe the answer is:
roe
'caviar' is the definition.
(fish eggs)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for roe that I've seen before include "Mass of fish's eggs" , "Hoofed animal(s)" , "Mass of fish eggs" , "A mass of fish-eggs" , "If hard, eggs" .)