Impersonate Blair, making a mint (6)

I believe the answer is:

betony

'a mint' is the definition.
(plant of the mint family)

'impersonate blair' is the wordplay.
'impersonate' becomes 'be' (to 'be' someone - eg in a role play exercise).
'blair' becomes 'tony' (UK PM Tony Blair).
'be'+'tony'='BETONY'

'making' acts as a link.

(Another definition for betony that I've seen is " medicinal plant".)

I've seen this clue in The Guardian.

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