Take over for (7)
I believe the answer is:
relieve
'take over for' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for relieve that I've seen before include "Make less tedious, bring aid to (besieged place)" , "Assuage - take over duty from" , "Release from duty" , "Free from obligation" , "raise a siege" .)