Crossword Genius

Top ten supporting primate (4)

Ross

I believe the answer is:

apex

'top' is the definition.
(apex is a top or peak)

'ten supporting primate' is the wordplay.
'ten' becomes 'X' (Roman numeral).
'supporting' says to put letters next to each other (in a down clue, some letters go below others).
'primate' becomes 'ape' (large primate).
'x' put after 'ape' is 'APEX'.

(Other definitions for apex that I've seen before include "Peak, vertex" , "The tip or highest point (4)" , "Point or summit" , "The highest point of something" , "Pointed top" .)

I've seen this clue in The Telegraph.
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