Very popular ordinary drink (4)
I believe the answer is:
vino
'drink' is the definition.
(vino is a kind of drink)
'very popular ordinary' is the wordplay.
'very' becomes 'v' (abbreviation).
'popular' becomes 'in'.
'ordinary' becomes 'o' (abbreviation e.g. O-Levels).
'v'+'in'+'o'='VINO'
(Other definitions for vino that I've seen before include "Cheap wine" , "Wine, colloquially" , "Italian or informal wine" , "Wine (slang)" , "Exotic wine" .)