Characters, those with tenants? (7)
I believe the answer is:
letters
This clue is a double definition.
'characters' is the first definition.
(letter is a kind of character)
'those with tenants?' is the second definition.
(people who let property to tenants)
(Other definitions for letters that I've seen before include "A, B, C, D etc" , "They may indicate a degree" , "Characters" , "eg E G" , "They are bound to look after tenants" .)