Fishballs? (3)

I believe the answer is:

roe

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If this is the answer, I'm afraid I cannot explain it.

(Other definitions for roe that I've seen before include "Fish eggs; small deer" , "Caviar" , "If hard, eggs" , "Hoofed animal(s)" , "A mass of fish-eggs" .)

I've seen this clue in The Independent.

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