Tiny workers’ high-rise accommodation (7)
I believe the answer is:
anthill
'accommodation' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'tiny workers' high-rise' is the wordplay.
'tiny workers' high' becomes 'ant' (I can't explain this - if you can you should give a lot more credence to this answer).
'rise' becomes 'hill' (I've seen this before).
'ant'+'hill'='ANTHILL'
Can you help me to learn more?
(Other definitions for anthill that I've seen before include "Home to thousands" , "lots of workers" , "Termite mound" , "Scene of great activity" , "Many a worker here" .)