Crossword Genius

An illegal dispatch (13)

Ross

I believe the answer is:

assassination

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'dispatch' is the definition.
(thesaurus)

I can't explain the rest of the clue.

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(Other definitions for assassination that I've seen before include "(Eg, political) murder" , "Politically-inspired murder" , "Political killing" , "Merciful, lenient" , "Ordered killing" .)

I've seen this clue in The Guardian and The Globe and Mail.
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