Popular swimmer's holding course for end of race (6,4)

'end of race' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Maybe there's a link between them I don't understand?

'popular swimmer's holding course' is the wordplay.
I cannot quite see how this works, but
'popular' could be 'in' ('in' can mean trendy) and 'in' is found in the answer.
'course' could be 'line' (synonyms) and 'line' is located in the answer.
'swimmer' could be 'fish' (fish swim) and 'fish' is present in the leftover letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

'for' acts as a link.