Crossword Genius

Achieve mounting progress? (3,2)

Ross

I believe the answer is:

get on

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'progress?' is the definition.
('get on' can be a synonym of 'progress')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for get on that I've seen before include "Make progress; be friends" , "Make progress or mount up" , "Board - prosper" , "Board; establish good relations" , "Age; prosper" .)

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