One renting basic accommodation outside centre of Monaco (6)
I believe the answer is:
tenant
'one renting' is the definition.
(person renting a property)
'basic accommodation outside centre of monaco' is the wordplay.
'basic accommodation' becomes 'tent' (basic type of shelter).
'outside' indicates putting letters inside.
'centre of' says to take the centre.
The middle of 'monaco' is 'na'.
'tent' going around 'na' is 'TENANT'.
(Other definitions for tenant that I've seen before include "Anne Bronte's novel 'The ...... of Wildfell Hall'" , "One who pays the landlord" , "He pays rent for lodgings" , "Lessee" , "Someone who pays rent" .)