Picks out people without partners (7)

I believe the answer is:

singles

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'picks' is the definition.
The definition and answer can be both acts as well as being plural nouns.
Maybe they are linked in a way I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.

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