Just beat up again (3)

I believe the answer is:

pip

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'just beat' is the definition.
(as in pipping someone to the post)

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

Can you help me to learn more?

(Other definitions for pip that I've seen before include "Just beat, often at the post" , "'Seed, of an apple say (3)'" , "Narrowly beat" , "Philip" , "Annoyed" .)

I've seen this clue in the Evening Standard.

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