Crossword Genius

Matches for the unattached? (7)

Ross

I believe the answer is:

singles

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'matches for the unattached?' is the definition.
I can't tell whether this defines the answer.

'matches for the unattached?' is the wordplay.
'matches' becomes 's' (I can't justify this - if you can you should believe this answer much more).
'for' says to put letters next to each other (I've seen this in other clues).
'the unattached?' becomes 'single' (without a partner).
's' put after 'single' is 'SINGLES'.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.
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