Harass about the large number requiring tenants (7)
I believe the answer is:
torment
'harass' is the definition.
(I've seen this before)
'about the large number requiring tenants' is the wordplay.
'about' means one lot of letters goes inside another.
'the large number' becomes 'm'.
'requiring tenants' becomes 'torent' (I can't explain this - if you can you should give a lot more credence to this answer).
'm' inserted into 'torent' is 'TORMENT'.
Can you help me to learn more?
(Other definitions for torment that I've seen before include "Pester in a cruel way" , "Physical or mental pain" , "Harass" , "Pester annoyingly" , "Cause great pain to" .)