Crossword Genius

Spank husband mixing with riff-raff (6)

Ross

I believe the answer is:

thrash

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'spank' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

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(Other definitions for thrash that I've seen before include "Wallop" , "Hit hard" , "Administer sound beating to" , "Beat up, batter" , "Decisively beat" .)

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