Drink for everybody, including company, on house (7)
I believe the answer is:
alcohol
'drink' is the definition.
(alcohol is a kind of drink)
'everybody including company on house' is the wordplay.
'everybody' becomes 'all' (I've seen this before).
'including' indicates putting letters inside.
'company' becomes 'co' (abbreviation).
'on' says to put letters next to each other.
'house' becomes 'ho' (abbreviation for house**).
'co'+'ho'='coho'
'all' enclosing 'coho' is 'ALCOHOL'.
'for' is the link.
(Other definitions for alcohol that I've seen before include "Booze" , "lager, perhaps" , "John Barleycorn" , "solvent" , "The bottle" .)