Possible result of good polishing (6)

I believe the answer is:

lustre

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'possible' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'result of good polishing' is the wordplay.
'result' anagrams to 'LUSTRE'.
Though, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for lustre that I've seen before include "Glory, distinction" , "Gentle sheen, soft glow" , "Gloss, brightness" , "Sheen - glaze" , "Rustle up the sheen" .)

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

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