Exposes market's tricks (9)
I believe the answer is:
outsmarts
'tricks' is the definition.
(I've seen this in another clue)
'exposes market's' is the wordplay.
'exposes' becomes 'outs' (outing is a kind of exposing).
'market's' becomes 'mart's' ('mart' can be a synonym of 'market').
'outs'+'marts'='OUTSMARTS'
I've seen this clue in The Sun.
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