Top card (3)

I believe the answer is:

ace

'top card' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for ace that I've seen before include "Tennis serve that the receiver is unable to reach" , "Test pilot'" , "Possibly a diamond" , "one among a set of diamonds" , "Virtuoso" .)

I've seen this clue in The New York Times, the King Feature Syndicate, the Evening Standard, The Star Tribune and The Mirror.

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