Bubbly Victor Mature embracing knight? (9)
I believe the answer is:
champagne
'bubbly' is the definition.
(I know that bubbly can be written as champagne)
'victor mature embracing knight?' is the wordplay.
'victor' becomes 'champ' (I've seen this in another clue).
'mature' becomes 'age' (synonyms).
'embracing' indicates putting letters inside.
'knight?' becomes 'n' (chess abbreviation).
'age' going around 'n' is 'agne'.
'champ'+'agne'='CHAMPAGNE'
(Other definitions for champagne that I've seen before include "Fizz" , "Sparkling wine of north-eastern France" , "tipple" , "Fizzy drink" , "the stuff of success?" .)