Crossword Genius

Flounder for the party (6)

Ross

I believe the answer is:

thrash

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'party' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

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(Other definitions for thrash that I've seen before include "Administer severe beating to" , "wild party" , "Beat hard" , "Beat heavily, perhaps with whip" , "Trounce, beat soundly" .)

I've seen this clue in the Evening Standard.
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