Its easy to produce a medicinal herb (6)

I believe the answer is:

simple

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'herb' is the definition.
(simple is a kind of herb)

I don't understand how the remainder of the clue works.

(Other definitions for simple that I've seen before include "Impels (anag.)" , "Easy; plain" , "Impels to be plain" , "Not complex, easy to do" , "The sort of interest" .)

I've seen this clue in The Irish News.

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