Tenant doesn't have right key (5)
I believe the answer is:
enter
'key' is the definition.
(key on a computer keyboard)
'tenant doesn't have right' is the wordplay.
'tenant' becomes 'renter' (synonyms).
'doesn't have' is a deletion indicator.
'right' becomes 'r' (common abbreviation).
'renter' with 'r' taken away is 'ENTER'.
(Other definitions for enter that I've seen before include "Join (for the first time)" , "Infiltrate" , "Move into" , "Fill in" , "Go in and put in the ledger" .)