Assumed, for the moment, that I do rent out (5,2)
I believe the answer is:
tried on
'assumed for the moment' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'i do rent out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'i'+'do'+'rent'='idorent'
'idorent' with letters rearranged gives 'TRIED ON'.
'that' acts as a link.
Can you help me to learn more?
(Other definitions for tried on that I've seen before include "tested for suitability" , "Donned a garment to see if it suited" , "Tested the fit of (a garment)" , "Checked shirt perhaps" .)