Amusingly dishes out mains and it's not pretty (4)

I believe the answer is:

ugly

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'not pretty' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for ugly that I've seen before include "Deficient in beauty" , "Like an eyesore" , "Nasty to look at" , "Unsightly, not pretty" , "Grotesque" .)

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

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