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Perfectly
performed
in
most
social
classes
(4)
Perfectly performed in most social classes (4)
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The definition is at the beginning of the clue.
How the clue works
The definition here is Perfectly performed — to have aced something is to have done it perfectly. The wordplay comes from the social classes A, B, C, D and E, with "most" telling us to take all but one of them (dropping B), leaving the letters that make up ACED.