Cryptic crossword clue
Fast cuckoo, one doing a marathon? 10

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

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Buddy explains!

The straight part
We know that "Fast cuckoo" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fast cuckoo = roadrunner.
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 ROADRUNNER mean?

ROADRUNNER noun
  1. Either of two species of bird in the genus Geococcyx of the cuckoo family, native to North and Central America. They are fast runners.

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