Audience member who interrupts or abuses a speaker (7)

I believe the answer is:

heckler

(Other definitions for heckler that I've seen before include "One barracking a public speaker" , "Person who jeers speaker from the crowd" , "Political barracker" , "One interrupts a public speaker with abusive comments" , "Disruptive sort" .)

I've seen this clue in the Sydney Morning Herald.

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