For which the hair stylist needs some new premises (4)
I believe the answer is:
perm
This might be a double definition.
'for which the hair stylist' is the first definition.
The definition suggests a singular noun which matches the answer.
'some new premises' is the second definition.
The answer and definition can be both locations as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'needs' acts as a link.
Can you help me to learn more?
(Other definitions for perm that I've seen before include "A hairdo; Urals city" , "To curl (hair)" , "combo in pools" , "make waves" , "Russian port; hairstyle" .)