Cloak or coat (4)
I believe the answer is:
hide
I believe this clue is a double definition.
'cloak' is the first definition.
(thesaurus)
'coat' is the second definition.
(thesaurus)
'or' acts as a link.
(Other definitions for hide that I've seen before include "Shelter" , "Animal's tough skin" , "A flower; an instrument" , "Keep secret, skin" , "Screen; skin" .)