Discussed nuclei movement? (5)

I believe the answer is:

cause

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'movement?' is the definition.
(I know that movement can be written as cause)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for cause that I've seen before include "Genesis" , "Make happen; something deserving support" , "Bring about" , "Producer of an effect" , "Give rise to" .)

I've seen this clue in the Sydney Morning Herald.

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