Sprinkle brand-new flavouring (10)
I believe the answer is:
peppermint
'flavouring' is the definition.
(peppermint is a kind of flavouring)
'sprinkle brand-new' is the wordplay.
'sprinkle' becomes 'pepper' (I've seen this before).
'brand new' becomes 'mint' (I've seen this in other clues).
'pepper'+'mint'='PEPPERMINT'
(Other definitions for peppermint that I've seen before include "herb" , "flavour" , "Aromatic plant" , "Pungent sweet" , "Sweet flavoured with aromatic oil" .)