Roof off cosy place, our home (5)
I believe the answer is:
earth
'our home' is the definition.
(I've seen this before)
'roof off cosy place' is the wordplay.
'roof off' means to remove the first letter (in a down clue, roof could mean the top letter).
'cosy place' becomes 'hearth'.
'hearth' with its first letter removed is 'EARTH'.
(Other definitions for earth that I've seen before include "It is necessary to clear" , "Connection between an electrical device and conductor" , "Soil; electrical ground" , "Mud" , "Third rock from the Sun" .)