Take over from a king and two biblical characters (7)
I believe the answer is:
relieve
'take over from' is the definition.
(synonyms)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for relieve that I've seen before include "raise a siege" , "help" , "Palliate" , "Break the sameness of" , "Take a job over from - bring aid" .)