Non-flowering plant westwards somewhat unrefined (4)

I believe the answer is:

fern

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'non-flowering plant' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for fern that I've seen before include "Fronded plant" , "Plant reproducing by spores" , "Feathery-leaved plant" , "Often shady plant" , "Non-flowering plant" .)

I've seen this clue in The Telegraph.

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