Articulation associated with a cockney accent (7,4)

I believe the answer is:

glottal stop

(Other definitions for glottal stop that I've seen before include "Sound of mild explosion" , "Phoneme of some languages (eg, Arabic)" , "(In German) speech sound at start of some vowels" , "Part of Cockney's speech" , "Consonant sound in some languages" .)

I've seen this clue in The Times.

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