Crossword Genius

True lady undone in this? (8)

Ross

I believe the answer is:

adultery

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'this?' is the definition.
The definition suggests a singular noun which matches the answer.

'true lady undone' is the wordplay.
'undone' indicates anagramming the letters.
'true'+'lady'='truelady'
'truelady' with letters rearranged gives 'ADULTERY'.

'in' is the link.

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(Other definitions for adultery that I've seen before include "Marital infidelity - try a duel (anag)" , "The act of marital infidelity" , "form of betrayal" , "Moral lapse" , "frowned-on relations" .)

I've seen this clue in The Sun.
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