Not at home on a road (4)
I believe the answer is:
away
'not at home' is the definition.
(I've seen this before)
'on a road' is the wordplay.
'on' says to put letters next to each other.
'road' becomes 'way' (I've seen this in other clues).
'a' put next to 'way' is 'AWAY'.
(Other definitions for away that I've seen before include "On holiday" , "Missing" , "Not at home, somewhere else" , "and 9: Christmas carol" , "At a distance, from home say" .)