Stop preparing for dispatch? (4,2)

I believe the answer is:

pack up

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'stop' is the definition.
Both the definition and answer are verbs in their base form.
Maybe they are linked in a way I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for pack up that I've seen before include "(Of a machine) break down" , "Stop working" .)

I've seen this clue in the Evening Standard.

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