Picks out individual matches (7)
I believe the answer is:
singles
'picks' is the definition.
The definition and answer can be both acts as well as being plural nouns.
Maybe there's a link between them I don't understand?
'individual matches' is the wordplay.
'individual' becomes 'single'.
'matches' becomes 's' (I can't justify this - if you can you should believe this answer much more).
'single'+'s'='SINGLES'
'out' is the link.
Can you help me to learn more?
(Other definitions for singles that I've seen before include "Ones" , "Form of tennis" , "Type of tennis match" , "Non-return tickets" .)