Flavouring from wine drink put back into pop (7)
I believe the answer is:
paprika
'flavouring' is the definition.
(paprika is a kind of flavouring)
'wine drink put back into pop' is the wordplay.
'wine drink' becomes 'kir' (type of wine).
'put back' is a reversal indicator.
'into' means one lot of letters goes inside another.
'pop' becomes 'papa' (both can mean father).
'kir' back-to-front is 'rik'.
'rik' inserted into 'papa' is 'PAPRIKA'.
'from' is the link.
(Other definitions for paprika that I've seen before include "Powdered hot spice" , "Condiment" , "Powder made from dried red pepper" , "Hot powder" , "strong-tasting spice" .)