Crossword Genius

Question a witch, say (5)

Ross

I believe the answer is:

which

'question' is the definition.

'a witch say' is the wordplay.
'say' indicates a 'sounds like' (homophone) clue.
'witch' is a homophone of 'WHICH'.

(Other definitions for which that I've seen before include "What one?" , "Organisation giving information to consumers" , "Consumer magazine" .)

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