Strip to conceal curtain fixtures (6)
I believe the answer is:
pelmet
'strip to conceal curtain fixtures' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for pelmet that I've seen before include "Fringe hiding a curtain rod" , "Narrow border across top of window" , "Temple (anag)" , "Covering over curtain fixtures" , "Ornamental strip to conceal curtain-rail" .)