Prosper from most of the rent (6)
I believe the answer is:
thrive
'prosper' is the definition.
(I know that prosper can be written as thrive)
'most of the rent' is the wordplay.
'most of' means to remove the last letter.
'rent' becomes 'rive' (I can't justify this - if you can you should believe this answer much more).
'the' with its last letter removed is 'th'.
'th'+'rive'='THRIVE'
'from' acts as a link.
Can you help me to learn more?
(Other definitions for thrive that I've seen before include "Develop well" , "Hit rev in order to prosper" , "Grow strongly" , "Be successful" , "Succeed" .)