Strong flavouring (7)
I believe the answer is:
aniseed
'strong flavouring' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for aniseed that I've seen before include "taste of Pernod, perhaps?" , "Strong flavour" , "Cake flavouring" , "Liquorice flavouring, used in cookery" , "Licorice-flavoured sweets" .)