Something fragrant wafting back from lime leaves (5)
I believe the answer is:
elemi
'something fragrant wafting' is the definition.
I can't tell whether this definition defines the answer.
'back from lime leaves' is the wordplay.
'back' is a reversal indicator.
'from' says the answer is hidden in the clue.
'imele' can be found hidden inside 'lime leaves'.
'imele' in reverse letter order is 'ELEMI'.
Can you help me to learn more?
(Other definitions for elemi that I've seen before include "Tree resin; ie, elm (anag.)" , "Resinous stuff" , "It's fragrance" , "Fragrant substance" , "Extract" .)