Crossword Genius

Runs lightly onto the scene - and stumbles! (5,2)

Ross

I believe the answer is:

trips up

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'stumbles' is the definition.
('trip up' can be a synonym of 'stumble')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for trips up that I've seen is " mistakes".)

I've seen this clue in The Irish News.
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