Leather cover (4)
I believe the answer is:
hide
I believe this clue is a double definition.
'leather' is the first definition.
(thesaurus)
'cover' is the second definition.
(hide is a kind of cover)
(Other definitions for hide that I've seen before include "Place to observe wildlife" , "Secrete, conceal" , "Bury" , "Shelter" , "Pelt; conceal" .)