Jeweller's nurse carrying note (7)
I believe the answer is:
cartier
'jeweller's' is the definition.
(French jewellery company)
'nurse carrying note' is the wordplay.
'nurse' becomes 'carer' (I've seen this before).
'carrying' means one lot of letters goes inside another.
'note' becomes 'ti' (musical note as in do re mi fa so la ti).
'carer' enclosing 'ti' is 'CARTIER'.
(Other definitions for cartier that I've seen before include "French explorer" , "Famous jeweller" , "Noted jewellery company" .)