Sounds like bun fight with eggs (3)

I believe the answer is:

roe

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'eggs' is the definition.
(I've seen this in other clues)

I can't explain the remainder of the clue.

(Other definitions for roe that I've seen before include "Hoofed animal(s)" , "Part of fish, sounds like go through water" , "eg Caviare" , "Swift runner" , "Mass of fish's eggs" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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