Hairdresser's shop (5)
I believe the answer is:
'hairdresser's shop' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for salon that I've seen before include "Hairdresser's shop" , "Establishment of beauty specialist or hairdresser" , "Drawing room" , "Room where beautician works" , "Elegant reception room" .)