Crossword Genius

Tennis for the unattached? (7)

Ross

I believe the answer is:

singles

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'tennis' is the definition.
(I know that singles is a type of tennis)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for singles that I've seen before include "Form of tennis" , "Ones" , "Type of tennis match" , "Non-return tickets" .)

I've seen this clue in The Mirror.
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