A ladder, dash it! (3)

I believe the answer is:

run

I'm a little stuck... Click here to teach me more about this clue!

'a ladder' is the definition.
(both can mean a tear in tights)

I cannot understand how the remainder of the clue works.

(Other definitions for run that I've seen before include "publish" , "Drive" , "Take flight" , "Organize" , "Hasten" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.