Crossword Genius

Eurasian plant of the mint genus that yields an aromatic oil used in medicine (10)

Ross

I believe the answer is:

pennyroyal

(Other definitions for pennyroyal that I've seen before include "medicinal plant" , "Small plant of mint family" , "Plant used in herbal medicine (part of the queen's shilling?)" .)

I've seen this clue in The Mirror.
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