Step in for topless tenant (5)
I believe the answer is:
enter
'step in' is the definition.
(I've seen this in another clue)
'topless tenant' is the wordplay.
'topless' means to remove the first letter.
'tenant' becomes 'renter' (synonyms).
'renter' with its initial letter removed is 'ENTER'.
'for' is the link.
(Other definitions for enter that I've seen before include "Gain admission" , "Pierce" , "Join (for the first time)" , "Register formally as a participant" , "Introduce" .)