Crossword Genius

Harm setter’s mate (6)

Ross

I believe the answer is:

impair

'harm' is the definition.
(I've seen this before)

'setter's mate' is the wordplay.
'setter's' becomes 'im' (referring to the person who set the crossword).
'mate' becomes 'pair' (synonyms).
'im'+'pair'='IMPAIR'

(Other definitions for impair that I've seen before include "Courteous man (colloq.)" , "Make worse or less effective" , "Damage or handicap" , "blunt" , "Hurt or handicap" .)

I've seen this clue in The Hindu.
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