Fast moving stage success? (3)

I believe the answer is:

run

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

'success?' is the definition.
(run is a kind of success)

I don't understand how the rest of the clue works.

(Other definitions for run that I've seen before include "Administer" , "escape" , "publish" , "Discharge" , "string of performances" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app