He gets gold and silver frame of necklace - it's sparkling stuff (9)
I believe the answer is:
champagne
'sparkling stuff' is the definition.
(sparkling wine)
'he gets gold and silver frame of necklace' is the wordplay.
'he gets gold' becomes 'champ' (a champion gets the gold medal).
'and' means one lot of letters go next to another.
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'frame of' says to hollow out the word (remove centre letters) (use the outside letters which frame the word).
'necklace' with its centre taken out is 'ne'.
'champ'+'ag'+'ne'='CHAMPAGNE'
'it's' acts as a link.
(Other definitions for champagne that I've seen before include "the stuff of success?" , "tipple" , "Fizz" , "Sparking drink" , "Celebratory drink" .)