Current Magazine ends top (4)

I believe the answer is:

acme

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'top' is the definition.
(I know that top can be written as acme)

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

Can you help me to learn more?

(Other definitions for acme that I've seen before include "Summit - maximum" , "Top or highest point" , "Highest level or degree attainable" , "Top; peak" , "Zenith - optimum" .)

I've seen this clue in the Sydney Morning Herald.

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