Wear — don (6)
I believe the answer is:
assume
This clue is a double definition.
'wear' is the first definition.
(I know that wear can be written as assume)
'don' is the second definition.
(I've seen this before)
(Other definitions for assume that I've seen before include "Tale of the gods" , "Take as read" , "Take (responsibility)" , "Take (control)" , "Take for granted or agreed" .)