Young swimmers out with a girl once a week (6)
I believe the answer is:
friday
'a week' is the definition.
The definition and answer can be both related to time as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'young swimmers out with a girl' is the wordplay.
'young swimmers out' becomes 'fry' (I can't justify this - if you can you should believe this answer much more).
'with' indicates putting letters inside.
'a girl' becomes 'Ida'.
'fry' placed around 'ida' is 'FRIDAY'.
'once' acts as a link.
Can you help me to learn more?
(Other definitions for friday that I've seen before include "It's payday for some" , "Where the weekend starts?" , "Its child is loving and giving" , "Weekend start?" , "Day named after a Norse goddess" .)