Weather unsettled in part due to these constant movements (3,4)

I believe the answer is:

the runs

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'these constant movements' is the definition.
The definition suggests an adverb but the answer is not.

'weather unsettled in part' is the wordplay.
'in part' indicates a hidden word.
'THE RUNS' is hidden in the letters of 'weather unsettled'.

'due to' acts as a link.

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I've seen this clue in The Guardian.

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