Drink one after song captivates one! (7)
I believe the answer is:
chianti
'drink' is the definition.
(Chianti is an example)
'one after song captivates one' is the wordplay.
'one' becomes 'i' (Roman numeral).
'after' means one lot of letters go next to another.
'song' becomes 'chant' (I've seen this before**).
'captivates' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'chant' going around 'i' is 'chiant'.
'i' put after 'chiant' is 'CHIANTI'.
(Other definitions for chianti that I've seen before include "I can hit (anag) - alcoholic drink" , "Italian wine variety" , "I can hit for popular Italian wine" , "Chain it to popular Italian wine" , "Dry red Italian wine" .)