Assume (5)
'assume' is the definition.
(I know that assume can be written as adopt)
This is the entire clue.
(Other definitions for adopt that I've seen before include "Formally approve" , "choose as candidate" , "Take responsibility for" , "Accept as one's own" , "Start to wear" .)
'assume' is the definition.
(taking for granted is a kind of assuming)
This is all the clue.
(Other definitions for take for granted that I've seen before include "Treat casually and without respect" , "Assume" .)