Possessor of the wisdom of the ages? (4)
I believe the answer is:
sage
'possessor of the wisdom' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'of the ages?' is the wordplay.
'of' indicates anagramming the letters (the answer comes from or 'of' the letters).
'ages' anagrammed gives 'SAGE'.
Can you help me to learn more?
(Other definitions for sage that I've seen before include "Fragrant herb having wisdom" , "Learned" , "___ and onion" , "Solon, for instance" , "Herb for the wise one" .)