What might you tell children about to go out? (7,5)

I believe the answer is:

bedtime story

'what might you tell children' is the definition.
(story told to children before bed)

'to go out?' is the wordplay.
I cannot really see how this works, but
'to' is within the answer.
This explanation may well be incorrect...

'about' is the link.

I've seen this clue in The Times.

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