Take a risk on unknown woodland plant (6)

I believe the answer is:

betony

'woodland plant' is the definition.

'take a risk on unknown' is the wordplay.
'take a risk' becomes 'bet'.
'unknown' becomes 'y' (algebra).
'bet'+'on'+'y'='BETONY'

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

I've seen this clue in The Times.

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