Crossword Genius

By mentioning a purchase (3)

Ross

I believe the answer is:

buy

'a purchase' is the definition.
(buy is a kind of purchase)

'by mentioning' is the wordplay.
'mentioning' shows a homophone (sound like) (I've seen 'mentioned' mean this).
'by' is a homophone of 'BUY'.

(Other definitions for buy that I've seen before include "Purchase" , "Accept truth of (colloq.)" , "Get" , "Procure" .)

I've seen this clue in the Evening Standard.
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