It's wise to use its flavour in cooking (4)

I believe the answer is:

sage

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'it's wise' is the definition.
(I know this)

I don't understand the remainder of the clue.

(Other definitions for sage that I've seen before include "A herb or a guru" , "Herb; wise person" , "Seasoning for the wise one" , "Aromatic herb" , "Fragrant herb or wise man" .)

I've seen this clue in The Irish Independent.

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