Converted attic space (4)
I believe the answer is:
loft
'converted attic space' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for loft that I've seen before include "Elevation" , "Space inside a roof" , "Uppermost room" , "Place for keeping racing pigeons" , "Hit (a ball) high" .)