Screens the end (8)
I believe the answer is:
I believe this clue is a double definition.
'screens' is the first definition.
(I know this)
'the end' is the second definition.
('curtains' can mean someone's end or demise)
(Other definitions for curtains that I've seen before include "Hanging cloths" , "Death (slang)" , "Window drapes in slangy ending" , "Window coverings" , "I run cats up the drapes" .)