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Wood spirit is something used to promote Prohibition? (5)

Ross

I believe the answer is:

dryad

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'wood spirit' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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(Other definitions for dryad that I've seen before include "Mythological wood nymph" , "Nymph of trees" , "Wood-nymph" , "Woodland nymph" , "Woodland deity" .)

I've seen this clue in The Telegraph.
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