Aroma with allure picked up, imperial food (6)
I believe the answer is:
tiffin
'imperial food' is the definition.
(term for an Indian meal dating from imperial times)
'aroma with allure picked up' is the wordplay.
'aroma' becomes 'niff' (both can mean a smell).
'with' is a charade indicator (letters next to each other).
'allure' becomes 'it' ('it' can mean an alluring or attractive quality).
'picked up' says the letters should be written backwards.
'niff'+'it'='niffit'
'niffit' written backwards gives 'TIFFIN'.
(Other definitions for tiffin that I've seen before include "Lunch (British Raj)" , "Light midday meal in India" , "Snack, light meal (dated)" , "Indian midday meal" , "(Anglo Indian) lunch" .)