Fragrant rootstock of various irises used in perfumery (5)

I believe the answer is:

orris

(Other definitions for orris that I've seen before include "Perfume root" , "perfumery ingredient" , "Iris with fragrant rhizome" , "Old lace, made of gold or silver" , "Any of various kinds of iris" .)

I've seen this clue in The Mirror.

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