Crossword Genius

Herb is a wise old fellow (4)

Ross

I believe the answer is:

sage

I'm a little stuck... Click here to teach me more about this clue!

'herb' is the definition.
(I know that sage is a type of herb)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for sage that I've seen before include "Savant" , "Fragrant herb or wise man" , "Profoundly wise" , "Wise woman" , "Fragrant herb having wisdom" .)

I've seen this clue in the Evening Standard.
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