Jumped over obstruction avoiding pitfall initially noticed inside (5)

I believe the answer is:

leapt

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'jumped over' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

(Other definitions for leapt that I've seen before include "Jumped on plate" , "Jumped, sprang" , "rose fast" , "Made spring" , "Vaulted" .)

I've seen this clue in The Independent.

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