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Set off strikes with uncertainty (4)

Ross

I believe the answer is:

risk

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'uncertainty' is the definition.
(thesaurus)

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(Other definitions for risk that I've seen before include "Assessment of potential dangers -- any silk saris (anag)" , "Danger or hazard" , "Element of uncertainty" , "Expose to danger" , "Jeopardy" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.
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