Drink for example supplied with good snack (6,3)
I believe the answer is:
scotch egg
'snack' is the definition.
(a Scotch egg might be eaten as a snack)
'drink for example supplied with good' is the wordplay.
'drink' becomes 'scotch' (Scotch is an example).
'for example' becomes 'e.g.' (short for 'exempli gratia', 'for example' in Latin).
'supplied with' means one lot of letters go next to another.
'good' becomes 'g' (abbreviation).
'scotch'+'eg'+'g'='SCOTCH EGG'
(Other definitions for scotch egg that I've seen before include "Hard-boiled item in sausage meat" , "fried snack" , "Savoury rolled food item" , "Savoury snack" , "Snack made largely of sausage meat" .)