Cryptic crossword clue
Long-distance athlete creating damage on heart, running 10

The most common and most likely answer to this crossword clue is the 10 letter word MARATHONER

M
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Buddy explains!

The straight part
We know that "Long-distance athlete" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case long-distance athlete = marathoner.
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.

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