Tenant getting not as many keys (6)
I believe the answer is:
lessee
'tenant' is the definition.
(lessee is a kind of tenant)
'not as many keys' is the wordplay.
'not as many' becomes 'less' (less means not as many).
'keys' becomes 'ee' (the musical key E written twice).
'less'+'ee'='LESSEE'
'getting' acts as a link.
(Other definitions for lessee that I've seen before include "One granted temporary use of property" , "Leaseholder" , "One holds a lease" , "The one taking out lease" , "Tenant with a contract" .)