Forbidding rents to be revised (5)
I believe the answer is:
stern
'forbidding' is the definition.
(synonyms)
'rents to be revised' is the wordplay.
'to be revised' is an anagram indicator.
'rents' anagrammed gives 'STERN'.
(Other definitions for stern that I've seen before include "Severe, forbidding" , "Rents out at rear of boat" , "Demanding < back" , "Where sailors may be" , "discipline" .)