Fur mask (4)
I believe the answer is:
hide
This clue is a double definition.
'fur' is the first definition.
(I've seen this in another clue)
'mask' is the second definition.
(both can mean to conceal or cover up)
(Other definitions for hide that I've seen before include "mask" , "Flog" , "Shelter" , "cloak" , "Pelt; conceal" .)