Small piece of meat I sent back - it's just for decoration (9)

I believe the answer is:

medallion

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'for decoration' is the definition.
(synonyms)

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

(Other definitions for medallion that I've seen before include "(Commemorative) disc" , "Circular decorative device - model nail (anag)" , "Ornamental disc on a chain" , "Cut" , "Large coin-shaped metal ornament" .)

I've seen this clue in The Independent.

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