Regularly intends to overhaul room (3)
I believe the answer is:
den
'room' is the definition.
(I know that den is a type of room)
'regularly intends to overhaul' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'to overhaul' is a reversal indicator (I've seen 'overhauling' mean this).
The alternating letters of 'intends' are 'ned'.
'ned' in reverse letter order is 'DEN'.
(Other definitions for den that I've seen before include "Animal's home or gent's study" , "Wild animal's home" , "Lair for animal or study for gent" , "Private office" , "Habitation of wild animals (3)" .)