Residents plaster over part of toilet blocks (9)
I believe the answer is:
occupants
'residents' is the definition.
('occupant' can be a synonym of 'resident')
'plaster over part of toilet blocks' is the wordplay.
I cannot quite understand how this works, but
'over' could be 'up' (I've seen this in other clues) and 'up' is found in the answer.
'part' could be 'can' (can is a kind of part) and 'can' is located in the remaining letters.
'of' could be 'o' and 'o' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for occupants that I've seen before include "Users" , "people inside?" .)