Restart seemingly relieved of constant worry (6)

I believe the answer is:

unease

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'worry' is the definition.
(thesaurus)

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

(Other definitions for unease that I've seen before include "State of worry and lack of confidence" , "State of anxiety" , "Disquiet" , "Discomfort or apprehension" , "Anxiety, discontent" .)

I've seen this clue in The Independent.

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