Swine supper (4)

I think it could be either:

Which length description are you looking for?:

4* 5*

(Other definitions for slop that I've seen before include "Household liquid refuse" , "discarded > loose garment" , "Cause to spill over" , "Spilled liquid" , "Liquid refuse, swill" .)

I've seen this clue in the Newsday and The Mirror.

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