Crossword Genius

Monkey to pass no sub up (7)

Ross

I believe the answer is:

colobus

'monkey' is the definition.
(I know that colobus is a type of Old World monkey)

'pass no sub up' is the wordplay.
'pass' becomes 'col' (col is a term for a mountain pass).
'no' becomes 'O' (O resembles 0).
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'sub' backwards is 'bus'.
'col'+'o'+'bus'='COLOBUS'

'to' is the link.

(Other definitions for colobus that I've seen before include "Seeing monkey" , "Slender monkey" , "Type of monkey" , "Leaf-eating monkey" , "African monkey" .)

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