New rents I introduce (6)
I believe the answer is:
insert
'introduce' is the definition.
(I know that introduce can be written as insert)
'new rents i' is the wordplay.
'new' indicates anagramming the letters.
'rents'+'i'='rentsi'
'rentsi' with letters rearranged gives 'INSERT'.
(Other definitions for insert that I've seen before include "Put in; enclosure" , "Loose ad in magazine" , "Put thing in between others" , "Push into" , "place in the interior" .)