Crossword Genius

Type of wine on billboard is a legendary divine type associated with oak, for one (5)

Ross

I believe the answer is:

dryad

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'type' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

I can't explain the remainder of the clue.

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(Other definitions for dryad that I've seen before include "Wood-nymph" , "Nymph of trees" , "Nymph of the woods" , "one stuck in a tree" , "Spirit in the wood" .)

I've seen this clue in the Irish Times.
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