Stop plugging uncouth war tunes (6)

I believe the answer is:

thwart

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'stop' is the definition.
(thesaurus)

'plugging uncouth war tunes' is the wordplay.
'THWART' is hidden within the letters.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for thwart that I've seen before include "Stymie" , "Frustrate, prevent from doing" , "Hinder or prevent" , "Prevent from succeeding" , "check" .)

I've seen this clue in The Independent.

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