Free ticket offered by a US city theater group (7)
I believe the answer is:
company
'theater group' is the definition.
(a group of actors)
'free ticket offered by a us city' is the wordplay.
'free ticket' becomes 'comp' (a complimentary ticket).
'offered by' says to put letters next to each other.
'us city' becomes 'NY' (short for New York).
'comp'+'a'+'ny'='COMPANY'
(Other definitions for company that I've seen before include "two, apparently?" , "See 10" , "Commercial business" , "Two, they say" , "Group of soldiers, business" .)