Powerless to revise the rent for one (5)
I believe the answer is:
inert
'powerless' is the definition.
(thesaurus)
'revise the rent for one' is the wordplay.
'revise' indicates anagramming the letters.
'for' means one lot of letters go next to another (I've seen this in other clues).
'one' becomes 'i' (Roman numeral**).
'rent' is an anagram of 'nert'.
'nert' put after 'i' is 'INERT'.
'to' acts as a link.
(Other definitions for inert that I've seen before include "Passive, immobile" , "Nothing doing" , "like neon" , "Incapable of acting, like some gas" , "Disinclined to act" .)