Do as bidden (4)
I believe the answer is:
obey
'do as bidden' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for obey that I've seen before include "Submit to authority" , "Be ruled by" , "Carry out (orders)" , "Perversely inclined to do the opposite" , "Toe the line" .)