Plot to strike causes uproar (6)
I believe the answer is:
bedlam
'uproar' is the definition.
(thesaurus)
'plot to strike' is the wordplay.
'plot' becomes 'bed' (bed is a kind of plot).
'to strike' becomes 'lam' (to 'lam' means to hit hard).
'bed'+'lam'='BEDLAM'
'causes' acts as a link.
(Other definitions for bedlam that I've seen before include "Blamed for intolerable noise" , "Place of uproar and confusion" , "State of extreme confusion and disorder" , "Complete chaos" , "Blamed for confused uproar" .)