Monarch, secretive, joining new knight somewhere in East Anglia (5,4)
I believe the answer is:
kings lynn
'somewhere in east anglia' is the definition.
The definition suggests a singular noun which matches the answer.
'monarch secretive joining new knight' is the wordplay.
I cannot really understand how this works, but
'monarch' could be 'king' (male monarch) and 'king' is found in the answer.
'secretive' could be 'sly' (I've seen this in other clues) and 'sly' is located in the answer.
'new' could be 'n' (abbreviation as in New Testament NT) and 'n' is located in the answer.
'knight' could be 'n' (chess abbreviation) and 'n' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for kings lynn that I've seen before include "Norfolk market town" , "English town" , "Place" , "English port" .)