Londoner likely to knock Hoskins's head off? (7)

I believe the answer is:

cockney

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'londoner' is the definition.
(Cockney is an example)

I don't understand how the rest of the clue works.

(Other definitions for cockney that I've seen before include "London East-ender" , "Someone born within earshot of Bow bells" , "Native of London's East End" , "One born within the sound of Bow bells" .)

I've seen this clue in The Independent.

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