Crossword Genius

Top primate with cross (4)

Ross

I believe the answer is:

apex

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

'primate with cross' is the wordplay.
'primate' becomes 'ape' (large primate).
'with' is a charade indicator (letters next to each other).
'cross' becomes 'x' (X is cross-shaped).
'ape'+'x'='APEX'

(Other definitions for apex that I've seen before include "white collar union" , "climax" , "Culmination" , "Uppermost tip" , "Cheap fare" .)

I've seen this clue in The Telegraph.
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