Fireplace shelf (6)
I believe the answer is:
mantel
'fireplace shelf' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for mantel that I've seen before include "prize-winning novelist" , "Shelf above a fireplace" , "Award-winning author" , "Hilary?" , "Lament over fireplace structure" .)