Emile concocted a fragrant substance (5)
I believe the answer is:
elemi
'a fragrant substance' is the definition.
(I've seen this before)
'emile concocted' is the wordplay.
'concocted' is an anagram indicator.
'emile' with letters rearranged gives 'ELEMI'.
(Other definitions for elemi that I've seen before include "Fragrant resin used as incense - Emile (anag)" , "Fragrant substance" , "It's fragrance" , "Fragrant tree resin used as incense - I'm Lee (anag)" , "Extract" .)