Wise king on his own one day? (7)
I believe the answer is:
solomon
'wise king' is the definition.
(I've seen this before)
'one day?' is the wordplay.
'one' becomes 'solo' (I've seen this before).
'day?' becomes 'mon' (abbreviation for Monday).
'solo'+'mon'='SOLOMON'
'on his own' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for solomon that I've seen before include "Short-lived" , "Wise old king of Israel" , "Very wise ruler" , "Wise man" , "King of Israel noted for his wisdom" .)