Skin infection; precious stone (9)

I believe the answer is:

carbuncle

(Other definitions for carbuncle that I've seen before include "Severe abscess in the skin" , "eyesore architecturally" , "National Gallery's Sainsbury Wing?" , "Bright red gem; boil" , "Large boil-like inflammation - gemstone" .)

I've seen this clue in the Sydney Morning Herald.

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