What no maiden would have in a stocking (3)

I believe the answer is:

run

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'stocking' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for run that I've seen before include "issue" , "freedom of access" , "Discharge" , "Manage; flee" , "Cricket score; go" .)

I've seen this clue in the Evening Standard.

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