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When to trot out a childish story (7)

Ross

I believe the answer is:

bedtime

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'story' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

I cannot understand how the rest of the clue works.

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(Other definitions for bedtime that I've seen before include "when story comes out?" , "when one's due for retirement?" , "When someone retires" , "The hour for retiring" , "Hour to retire" .)

I've seen this clue in the Evening Standard.
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