Crossword Genius

When a yes conceals a no (3)

Ross

I believe the answer is:

nay

'a no' is the definition.
(thesaurus)

'when a yes conceals' is the wordplay.
'conceals' indicates the answer is hidden within the clue.
'NAY' can be found hidden inside 'when a yes'.

(Other definitions for nay that I've seen before include "No - a negative vote" , "Indeed" , "No (dialect); or rather" , "Archaic negative" , "Negative response" .)

I've seen this clue in The Times.
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