Mix up one thousand with one hundred, as shown in illustration (9)

I believe the answer is:

implicate

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'mix up' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for implicate that I've seen before include "Involve in a crime, give evidence accordingly" , "Suggest involvement" , "Grass up" , "Suggest someone else is involved in your crime" , "Suggest someone is involved or took part in a crime" .)

I've seen this clue in The Times.

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