Possible Clues:

• Listen vaguely, not speaking
• ... still audibly exhale topping fast time
• Still half sick, left hospital department
• Christmas Eve was such a quiet night
• Like the opening letter of each of the four longest answers
• Still, lift is fast
• '... Night, Holy Night' (carol)
• Mum is coming over fast
• Listen out for mum
• Cellphone setting