Climb and come forward (4,2)

I believe the answer is:

step up

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'come forward' is the definition.
(synonyms)

I can't explain the rest of the clue.

(Other definitions for step up that I've seen before include "Accelerate - promotion" , "Advancement (on a ladder or career)" , "- Bezukhov (War and Peace)" , "Come forward" , "Sudden increase (in rate, output, etc)" .)

I've seen this clue in The Hindu.

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