Nobleman expected to receive king (4)
I believe the answer is:
duke
'nobleman' is the definition.
(duke is a kind of nobleman)
'expected to receive king' is the wordplay.
'expected' becomes 'due' (similar in meaning).
'to receive' is an insertion indicator.
'king' becomes 'k' (chess abbreviation).
'due' placed around 'k' is 'DUKE'.
(Other definitions for duke that I've seen before include "- - Ellington (jazz musician)" , "Highest hereditary title in Britain" , "Highest ranking British peer" , "Fist (sl.)" , "Highest rank of British peer" .)