American with knight welcomed by adorable king (6)
I believe the answer is:
canute
'king' is the definition.
(King Canute, 11th-century king)
'american with knight welcomed by adorable' is the wordplay.
'american with' becomes 'a' (I can't justify this - if you can you should give a lot more credence to this answer).
'knight' becomes 'n' (chess abbreviation).
'welcomed by' is an insertion indicator (letters welcomed inside).
'adorable' becomes 'cute' (both can mean lovable).
'a'+'n'='an'
'an' inserted within 'cute' is 'CANUTE'.
Can you help me to learn more?
(Other definitions for canute that I've seen before include "English king who ordered waves to retreat" , "Old king of England who tried to stop the tide" , "Old English king who tried to turn the tide" , "English king who tried to command the waves" , "Ancient King who commanded the tide to retreat" .)