Crossword Genius

What a setter, or anyone antisocial, may drop (6)

Ross

I believe the answer is:

litter

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'drop' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

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(Other definitions for litter that I've seen before include "Do the kittens create rubbish?" , "dropped by a new dam, perhaps?" , "Light bed - rubbish" , "Offspring of a multiple birth" , "Clean up the canine offspring?" .)

I've seen this clue in The Times.
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