Crossword Genius

The only one in a suit (3)

Ross

I believe the answer is:

ace

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'one in a suit' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for ace that I've seen before include "Top playing card" , "strained" , "Single unit on playing cards" , "single > club > champion" , "first-class" .)

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