Main troublemaker (10)

I believe the answer is:

ringleader

'main troublemaker' is the definition.
(eg the ringleader of a crime)

This is the entire clue.

(Other definitions for ringleader that I've seen before include "firebrand" , "Main villain" , "Chief mischief maker" , "Chief troublemaker" , "Mastermind" .)

I've seen this clue in The Mirror.

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