Dutiful king left litter in the East (8)
I believe the answer is:
obedient
'dutiful' is the definition.
(similar in meaning)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for obedient that I've seen before include "Passive" , "Ready to agree" , "Doing what one is told, compliant" , "Ready to comply" , "Deferential" .)