One rough shelter for emperor (4)
I believe the answer is:
nero
'emperor' is the definition.
(Roman emperor)
'one rough shelter' is the wordplay.
'shelter' indicates a hidden word.
'NERO' is hidden in the letters of 'one rough'.
'for' acts as a link.
(Other definitions for nero that I've seen before include "Fiddling Roman emperor" , "Emperor (who fiddled while Rome burned?) d. AD68" , "Emperor who played the fiddle" , "Roman emperor infamous for his cruelty" , "Roman emperor who fiddled while Rome burned" .)