Crossword Genius

Thrash late attendee's bottom (5)

Ross

I believe the answer is:

paste

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'thrash' is the definition.
(thesaurus)

I can't explain the rest of the clue.

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(Other definitions for paste that I've seen before include "Creamy, sticky, or doughy mixture" , "Adhesive of mixed water and flour" , "Fake gems; adhesive" , "Adhesive; savoury spread" , "sound beating" .)

I've seen this clue in The Guardian.
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