Crossword Genius

Tiptop (4)

Ross

There are a few possibilities for this:

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4

5

I believe this is a double definition.

'tip' is the first definition.
(I've seen this in another clue)

'top' is the second definition.
(synonyms)

(Other definitions for acme that I've seen before include "high peak" , "Highest level or degree attainable" , "Point of maximum development" , "Peak of perfection" , "'Highest point, apex (4)'" .)

I've seen this clue in the Universal, the LA Times, The New York Times and The Telegraph.
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