Noble expected to embrace king (4)
I believe the answer is:
duke
'noble' is the definition.
(I know that duke is a type of noble)
'expected to embrace king' is the wordplay.
'expected' becomes 'due' (similar in meaning).
'to embrace' is an insertion indicator.
'king' becomes 'k' (abbreviation for king in chess).
'due' going around 'k' is 'DUKE'.
(Other definitions for duke that I've seen before include "Highest ranking British peer" , "noble" , "Lord" , "Nickname of John Wayne" , "Highest-ranking nobleman" .)