Sarah, operating in beauty parlour? (5)
I believe the answer is:
salon
'beauty parlour?' is the definition.
('salon' can be a synonym of 'beauty parlour')
'sarah operating' is the wordplay.
'sarah' becomes 'sal' (Sally is a common pet form of Sarah).
'operating' becomes 'on' (I've seen this in other clues).
'sal'+'on'='SALON'
'in' acts as a link.
(Other definitions for salon that I've seen before include "beautician's premises" , "Hairdresser's premises" , "Establishment of beauty specialist or hairdresser" , "(Room for) gathering of distinguished people" , "Strange loans for a hairdresser, perhaps" .)