Crossword Genius

Cast aspersions on (6)

Ross

I believe the answer is:

impugn

(Other definitions for impugn that I've seen before include "Challenge (e.g. honesty)" , "Blacken the name of" , "Attack as false, challenge" , "Call into question; criticise" , "Try to discredit, express doubts about honesty" .)

I've seen this clue in The New York Times and The Times.
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