Scented mixture is up to prior to arrange (9)
I believe the answer is:
potpourri
'scented mixture' is the definition.
'up to prior to arrange' is the wordplay.
'arrange' indicates anagramming the letters.
'up'+'prior'+'to'='uppriorto'
'uppriorto' with letters rearranged gives 'POTPOURRI'.
'is' is the link.
(Other definitions for potpourri that I've seen before include "Mixed bag - rip up root (anag)" , "fragrant blend" , "Fragrant mixture" , "Mixture of dried, scented items" , "Hotchpotch" .)