Crossword Genius

What’s maybe experienced by impatient practical joker in military retreat (4,5)

Ross

I believe the answer is:

long march

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'retreat' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's a link between them I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Another definition for long march that I've seen is " Famous journey of Chinese communists".)

I've seen this clue in The Times.
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