Fizzy drink with my northern cinema fare? (7)
I believe the answer is:
popcorn
'cinema fare?' is the definition.
(I've seen this before)
'fizzy drink with my northern' is the wordplay.
'fizzy drink' becomes 'pop' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'my' becomes 'cor' (I've seen this in other clues).
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'pop'+'cor'+'n'='POPCORN'
(Other definitions for popcorn that I've seen before include "Kernels exploded by heat" , "Maize heated into crisp edible balls, often eaten in cinema" , "Filmgoers' diet" , "Kernels that swell and burst with heat" , "At the cinema something to get through" .)