Possible Clues:

• Consonant sound in some languages
• Plosive sound, from the larynx
• Consonant sound produced by closing and suddenly opening the larynx or windpipe
• Pronunciation of a word, such as 'it for 'hit' — plot lost tag (anag)
• Idiosyncrasy of Cockney
• Sound of mild explosion as large figure tries, initially, to get into blouse, say?
• Linguist's non-sound
• Phoneme of some languages (eg, Arabic)
• (In German) speech sound at start of some vowels
• Part of Cockney's speech disheartened girl - total disaster to end