Crossword Genius

Dispute the honesty of (6)

Ross

I believe the answer is:

impugn

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

This is the entire clue.

(Other definitions for impugn that I've seen before include "Dispute the truth of" , "Call into question or attack by words" , "Express doubts about truth or honesty of, say motives" , "Try to discredit, express doubts about honesty" , "Attack verbally" .)

I've seen this clue in The Irish Times, The Times and the Irish Times (Simplex).
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