Laughs heartily, as aggressor drops eggs (5)

I believe the answer is:

roars

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'laughs heartily' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for roars that I've seen before include "Calls like lion" , "Deep bellows" , "Bellows like a bull" , "Sounds like a lion" , "'Deep, bellowing bursts of sound (5)'" .)

I've seen this clue in The Irish Times.

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