Crossword Genius

Cheating ruled out as wrong (10)

Ross

I believe the answer is:

adulterous

'cheating' is the definition.
('adulterous' can be a synonym of 'cheating')

'ruled out as wrong' is the wordplay.
'wrong' is an anagram indicator.
'ruled'+'out'+'as'='ruledoutas'
'ruledoutas' with letters rearranged gives 'ADULTEROUS'.

(Other definitions for adulterous that I've seen before include "Betraying a legal partner" , "untrue" .)

I've seen this clue in The Telegraph.
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