Crossword Genius

Walking out (12)

Ross

I believe the answer is:

somnambulism

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

This could be a double definition.

'walking' is the first definition.
(I know that somnambulism is a type of walking)

'out' is the second definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe there's a link between them I don't understand?

Can you help me to learn more?

(Another definition for somnambulism that I've seen is " Sleepwalking".)

I've seen this clue in The Independent.
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