Band in the theatre (6)
I believe the answer is:
circle
I believe this is a double definition.
'band' is the first definition.
(synonyms)
'in the theatre' is the second definition.
(as in circles of seats in a theatre)
(Other definitions for circle that I've seen before include "Geometric shape" , "Clique; loop" , "part of theatre" , "Level in theatre; round" , "Cycle - enclosure" .)