Orchestra in auditorium with echo (5)
I believe the answer is:
halle
'orchestra' is the definition.
(The Halle is a UK orchestra)
'auditorium with echo' is the wordplay.
'auditorium' becomes 'hall' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'echo' becomes 'e' (phonetic alphabet: alpha, bravo, charlie etc.).
'hall'+'e'='HALLE'
'in' acts as a link.
(Other definitions for halle that I've seen before include "Orchestra based in Manchester" , "Noted players" , "Name of orchestra" , "Manchester's orchestra" , "Berry, possibly" .)