The most common and most likely answer to this crossword clue is the 8 letter word CONDUCTS
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More clues leading to the result CONDUCTS
Buddy explains!

The straight part
We know that "Runs" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case runs = conducts.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 CONDUCTS mean?
CONDUCTS noun- The act or method of controlling or directing
- Skillful guidance or management; leadership
- Behaviour; the manner of behaving
- (of a literary work) plot; storyline
- Convoy; escort; person who accompanies another
- Something which carries or conveys anything; a channel; an instrument.
- To lead, or guide; to escort.
- To lead; to direct; to be in charge of (people or tasks)
- (reflexively to conduct oneself) To behave.
- To serve as a medium for conveying; to transmit (heat, light, electricity, etc.)
- To direct, as the leader in the performance of a musical composition.
- To act as a conductor (as of heat, electricity, etc.); to carry.
- To carry out (something organized)