Took on (7)
I believe the answer is:
assumed
'took on' is the definition.
('assume' can be a synonym of 'take on')
This is all the clue.
(Other definitions for assumed that I've seen before include "Took upon oneself" , "Taken as true; adopted" , "Affected; supposed" , "Bogus" , "Put it on - without being told?" .)