Crossword Genius

Proceed to mount (3,2)

Ross

I believe the answer is:

get on

I believe this clue is a double definition.

'proceed' is the first definition.
(thesaurus)

'mount' is the second definition.
('get on' can be a synonym of 'mount')

'to' acts as a link.

(Other definitions for get on that I've seen before include "Make progress, do well in life" , "Board vehicle or make progress" , "Board (a bus)" , "Make progress; be friends" , "Hit it off" .)

I've seen this clue in the Evening Standard.
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