It may flavour sweets and sandwiches I get (7)
I believe the answer is:
aniseed
'it may flavour sweets' is the definition.
(aniseed is used as a flavouring)
'and sandwiches i get' is the wordplay.
'sandwiches' means one lot of letters goes inside another (goes on either side like a sandwich).
'get' becomes 'see' (both can mean to understand).
'i'+'see'='isee'
'and' going around 'isee' is 'ANISEED'.
(Other definitions for aniseed that I've seen before include "Licorice-flavoured sweets" , "Strong flavour" , "Strong herbal flavouring" , "Flavouring of sambuca" , "Cake flavouring" .)