Song about one beginning to imbibe wine (7)
I believe the answer is:
chianti
'wine' is the definition.
(Chianti is an example)
'song about one beginning to imbibe' is the wordplay.
'song' becomes 'chant' (I've seen this before**).
'about' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
'beginning to' says to take the initial letters.
The first letter of 'imbibe' is 'i'.
'chant' placed around 'i' is 'chiant'.
'chiant'+'i'='CHIANTI'
(Other definitions for chianti that I've seen before include "European wine" , "Italian offering" , "Chain it to popular Italian wine" , "Italian wine - mountain range" , "Italian wine variety" .)