Knotted rug over Edward (6)
I believe the answer is:
matted
'knotted' is the definition.
(thesaurus)
'rug over edward' is the wordplay.
'rug' becomes 'mat' (both are floor coverings).
'over' is a charade indicator (letters next to each other) (in a down clue, some letters go over others).
'edward' becomes 'ted'.
'mat'+'ted'='MATTED'
(Other definitions for matted that I've seen before include "Tangled and thick, as hair may be" , "Tangled or dirty as hair may be" , "Like some wickets" , "Closely tangled as hair may be" , "Of hair, tangled and uncombed" .)