Flavouring aid, seen differently (7)
I believe the answer is:
aniseed
'flavouring' is the definition.
(I've seen this before)
'aid seen differently' is the wordplay.
'differently' indicates anagramming the letters.
'aid'+'seen'='aidseen'
'aidseen' is an anagram of 'ANISEED'.
(Other definitions for aniseed that I've seen before include "Plant" , "Strong flavour" , "Licorice-flavoured sweets" , "Strong flavouring often used in sweets" , "Flavouring of sambuca" .)