The most common and most likely answer to this crossword clue is the 9 letter word REHEARSES
I've seen this crossword clue in The Guardian
R
E
H
E
A
R
S
E
S
Buddy explains!
The straight part
We know that "Runs through" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case runs through = rehearses.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 REHEARSES mean?
REHEARSES verb- To repeat, as what has been already said; to tell over again; to recite.
- To narrate; to relate; to tell.
- To practise by recitation or repetition in private for experiment and improvement, prior to a public representation, especially in theater
- To cause to rehearse; to instruct by rehearsal.