Tenant fees seldom put up? Not entirely! (6)
I believe the answer is:
lessee
'tenant' is the definition.
(I know that lessee is a type of tenant)
'fees seldom put up? not entirely' is the wordplay.
'not entirely' says the answer is hidden in the clue.
'put up?' says the letters should be written backwards (I've seen 'puts up' mean this).
'eessel' is hidden within 'fees seldom'.
'eessel' back-to-front is 'LESSEE'.
(Other definitions for lessee that I've seen before include "Tenant who holds a lease" , "Hirer of property" , "One who rents" , "The one taking out lease" , "Person renting a property" .)