Cover front of television (6)
I believe the answer is:
screen
This clue is a triple definition!
'cover' is the first definition.
(I know that cover can be written as screen)
'front' is the second definition.
(thesaurus)
'of' acts as a link.
'television' is the third definition.
(thesaurus)
(Other definitions for screen that I've seen before include "Flat surface onto which images are projected" , "Sort out" , "Films are projected onto it" , "Partition; test suitability" , "Test for the presence of disease or infection, in the cinema?" .)