Wise thing to put in stuffing (4)

I believe the answer is:

sage

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'wise' is the definition.
(similar in meaning)

I don't understand how the remainder of the clue works.

(Other definitions for sage that I've seen before include "Fragrant herb or wise man" , "Fragrant herb having wisdom" , "cheesemongers associate with Derby" , "Herb; wise person" , "Oracle; herb" .)

I've seen this clue in The Times.

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