Crossword Genius

Prevent from succeeding (6)

Ross

I believe the answer is:

thwart

'prevent from succeeding' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for thwart that I've seen before include "Frustrate and obstruct" , "cross" , "check" , "Hinder or prevent" , "Stymie" .)

I've seen this clue in The Times.
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