Crossword Genius

Was a rum shrub containing ginger roots? (7)

Ross

I believe the answer is:

asarums

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'ginger roots?' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

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(Another definition for asarums that I've seen is " Ginger roots".)

I've seen this clue in The Times and The Sunday Times.
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