Crossword Genius

Nails, as a test (4)

Ross

I believe the answer is:

aces

'nails as a test' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for aces that I've seen before include "holes in one" , "They're high and low on cards" , "winning points" , "Top (or bottom) cards" , "Winning serves" .)

I've seen this clue in the Penny Press, the L.A. Times Daily and The Washington Post.
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