Crossword Genius

Weapon has a gentle hit in movement (8)

Ross

I believe the answer is:

catapult

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'weapon' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

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(Other definitions for catapult that I've seen before include "Child's stone shooter" , "Device with elastic for hurling small stones" , "Slingshot" , "Aircraft carrier launcher" , "Device for firing stones or rocks" .)

I've seen this clue in The Sun.
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