Rue not seeing later king about name for the future George IV (6)
I believe the answer is:
regent
'rue not seeing later king' is the definition.
I know that 'king' relates to this answer. I also know that both the answer and definition are singular nouns
'name for the future george iv' is the wordplay.
'name' becomes 'Reg' (Reg is a man's name).
'for' is a charade indicator (letters next to each other).
'the future george iv' becomes 'ent' (I can't justify this - if you can you should believe this answer much more).
'reg'+'ent'='REGENT'
'about' acts as a link.
Can you help me to learn more?
(Other definitions for regent that I've seen before include "Person who rules for a sovereign" , "One who acts for a monarch" , "Stand-in monarch" , "One acting for monarch who is a minor" , "Ruler during monarch's minority" .)