Wise person (4)
'wise person' is the definition.
(sage can mean a wise or holy person)
This is the entire clue.
(Other definitions for sage that I've seen before include "Salvia" , "Herb for the wise one" , "Clever" , "Herb; wise person" , "Solon, for instance" .)
(Other definitions for swami that I've seen before include "How to address Hindu dignitary" , "Term of respect to a Hindu teacher" , "Teacher abroad" , "Hindu holy man" , "Indian religious teacher" .)