Crossword Genius

Dispute the truth of (6)

Ross

I believe the answer is:

impugn

'dispute the truth of' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for impugn that I've seen before include "Challenge (e.g. honesty)" , "Express doubts about truth or honesty of, say motives" , "Try to discredit, express doubts about honesty" , "Attack verbally" , "Attack as false, challenge" .)

I've seen this clue in The Times.
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