Band unaltered after disc (5)
I believe the answer is:
oasis
'band' is the definition.
(I have seen 'British band' mean 'oasis' so perhaps 'band' could also mean 'oasis')
'unaltered after disc' is the wordplay.
'unaltered' becomes 'asis' (ie something left 'as is').
'after' means one lot of letters go next to another.
'disc' becomes 'o'.
'asis' after 'o' is 'OASIS'.
(Other definitions for oasis that I've seen before include "place of relief" , "source of water" , "Peaceful spot" , "Place of refreshment" , "Peaceful area away from trouble" .)