Havoc (5)

I think it could be either:

chaos

wreak

'havoc' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for wreak that I've seen before include "Inflict, bring about" , "Cause (havoc, say) to happen as a consequence" .)

I've seen this clue in the Penny Press and the Evening Standard.

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