Crossword Genius

Question the truth of (6)

Ross

I believe the answer is:

oppugn

'question the truth of' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for oppugn that I've seen before include "Dispute truth or validity of" , "Call into question" , "Question the validity of (something)" , "attack" .)

I've seen this clue in the New York Times, the Family Time and the Newsday.
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