Fix rail in high street establishment (4,3)
I believe the answer is:
nail bar
'high street establishment' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'fix rail' is the wordplay.
'fix' becomes 'nail' (I've seen this before).
'rail' becomes 'bar' (metal rail or bar).
'nail'+'bar'='NAIL BAR'
'in' is the link.
Can you help me to learn more?
(Other definitions for nail bar that I've seen before include "Manicurist's establishment" , "Manicure salon" , "Type of beauty parlour" .)