The most common and most likely answer to this crossword clue is the 13 letter word HALF-MARATHON
I've seen this crossword clue in The Guardian
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More clues leading to the result HALF-MARATHON
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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does HALF-MARATHON mean?
HALF-MARATHON noun- A running race over the distance of 21.0975 km, half the length of a marathon.