Quarters a forecast (5)
I believe the answer is:
abode
'quarters' is the definition.
(both can mean where someone lives)
'a forecast' is the wordplay.
'forecast' becomes 'bode' (synonyms).
'a'+'bode'='ABODE'
(Other definitions for abode that I've seen before include "Place of residence" , "stay" , "Where one lives" , "Archaic dwelling place" , "Pad" .)