Crossword Genius

Top copy letter (4)

Ross

I believe the answer is:

apex

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

'copy letter' is the wordplay.
'copy' becomes 'ape' (synonyms).
'letter' becomes 'x' ().
'ape'+'x'='APEX'

(Other definitions for apex that I've seen before include "white collar union" , "Uppermost tip" , "The highest point of something" , "Topmost point" , "climax" .)

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