The most common and most likely answer to this crossword clue is the 5 letter word HARES
I've seen this crossword clue in The Guardian
H
A
R
E
S
More clues leading to the result HARES
Buddy explains!

The straight part
We know that "Noted runners" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case noted runners = hares.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 HARES mean?
HARES noun- Any of several plant-eating animals of the family Leporidae, especially of the genus Lepus, similar to a rabbit, but larger and with longer ears.
- The player in a paperchase, or hare and hounds game, who leaves a trail of paper to be followed.
- To move swiftly.
- To excite; to tease, or worry; to harry.