Floor's regularly dirty in cheap accommodation (6)
I believe the answer is:
bedsit
'cheap accommodation' is the definition.
(type of residence)
'floor's regularly dirty' is the wordplay.
'floor's' becomes 'beds' (I can't explain this - if you can you should give a lot more credence to this answer).
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternate letters of 'dirty' are 'it'.
'beds'+'it'='BEDSIT'
'in' is the link.
Can you help me to learn more?
(Other definitions for bedsit that I've seen before include "One-room accommodation" , "One-roomed apartment" , "One-room living space" , "Single room for living" , "Simple accommodation" .)