House topper (4)
I believe the answer is:
roof
'house topper' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for roof that I've seen before include "hit by someone in a temper" , "It could be slated" , "Upper permitted limit" , "Topmost part" , "Mansard is an example of one" .)