Desire to prune mature plant (6)

I believe the answer is:

lovage

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'mature plant' is the definition.
(I know that lovage is a type of herb)

I don't understand the rest of the clue.

(Other definitions for lovage that I've seen before include "Herb made from a glove" , "herb flavouring" , "F" , "Parsley relative - a glove (anag)" , "Salad plant from a glove?" .)

I've seen this clue in The Telegraph.

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