With Ron, we confused proprietor (5)
I believe the answer is:
owner
'proprietor' is the definition.
(I know that owner is a type of person who lets something)
'with ron we confused' is the wordplay.
'with' is a charade indicator (letters next to each other).
'confused' indicates anagramming the letters.
'ron' next to 'we' is 'ronwe'.
'ronwe' with letters rearranged gives 'OWNER'.
(Other definitions for owner that I've seen before include "Keeper" , "One who has something" , "The person in legal possession" , "possessive type" , "The person in lawful possession" .)