Florentine iris (5)
I believe the answer is:
orris
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">florentine iris</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for orris that I've seen before include "Source of perfume" , "Perfume ingredient from irises" , "Iris root in perfumery" , "Fragrant rootstock" , "Percussion instrument" .)