Monarch unattended by day is wise man (4,7)

I believe the answer is:

king solomon

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'wise man' is the definition.
(I've seen this in another clue)

'monarch unattended by day' is the wordplay.
'monarch' becomes 'king' (male monarch).
'unattended by day' becomes 'solomon' (I can't explain this - if you can you should give a lot more credence to this answer).
'king'+'solomon'='KING SOLOMON'

'is' is the link.

Can you help me to learn more?

(Another definition for king solomon that I've seen is " Wise man, son of David and Bathsheba".)

I've seen this clue in The Guardian.

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