Defeat soundly (7)

I think it could be either:

Which length description are you looking for?:

4,3,5,4

trounce

'defeat soundly' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for trounce that I've seen before include "Beat severely" , "Beat heavily" , "Wipe the floor with" , "tank" , "Easily best" .)

I've seen this clue in The Times.

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