In while selling up: one has to leave (5)

I believe the answer is:

later

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'in' is the definition.
Both the definition and answer are adjectives. Maybe you can see a link between them that I don't see?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for later that I've seen before include "More recent" , "Eventually" , "Following" , "Not just yet" , "Alter (anag.)" .)

I've seen this clue in The Sun.

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