Wild Erica2,3 Arborea1,2,3 (5)

I believe the answer is:

briar

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'wild' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

I can't explain the remainder of the clue.

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(Other definitions for briar that I've seen before include "Tobacco pipe" , "Prickly scrambling shrub" , "Prickly wooden stem" , "Wild rose bush" , "Wood used for pipes" .)

I've seen this clue in The Guardian.

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