A rent isn't of short duration when revised (9)
I believe the answer is:
transient
'revised' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?
'a rent isn't of short duration' is the wordplay.
'a rent isn't' anagrams to 'TRANSIENT'.
However, I am not sure how the anagram is indicated.
'when' acts as a link.
Can you help me to learn more?
(Other definitions for transient that I've seen before include "Temporary worker" , "Passing, short-lived" , "Ephemeral" , "Lasting little time" , "Fleeting" .)