Crossword Genius

Primate to cross mountaintop (4)

Ross

I believe the answer is:

apex

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

'primate to cross' is the wordplay.
'primate' becomes 'ape' (large primate).
'to cross' becomes 'x' (X is cross-shaped).
'ape'+'x'='APEX'

(Other definitions for apex that I've seen before include "Uppermost tip" , "Top, peak" , "high-point" , "The highest point or peak" , "Culmination" .)

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