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It was meant to be decorative, but came to nothing (5)

Ross

I believe the answer is:

cameo

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(Other definitions for cameo that I've seen before include "Item of jewellery with a portrait - distinguished actor's minor role" , "Piece of jewellery; small role" , "Small part for star actor" , "Jewellery item with carved portrait" , "Brooch with an engraving in low relief" .)

I've seen this clue in The Globe and Mail.
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