Seasoning for the wise one (4)
I believe the answer is:
sage
'seasoning for the wise one' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sage that I've seen before include "Salvia" , "Herb used in cooking" , "Solon, for instance" , "Fragrant herb having wisdom" , "Profoundly wise" .)