He's making disturbing noise - worried responders sped off (6)
I believe the answer is:
snorer
'he's making disturbing noise' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'worried responders sped off' is the wordplay.
'worried' indicates anagramming the letters (worry can mean to interfere with or disturb).
'off' is a deletion indicator (some letters taken off).
'responders' with 'sped' taken out is 'roners'.
'roners' is an anagram of 'SNORER'.
Can you help me to learn more?
(Other definitions for snorer that I've seen before include "Noisy sleeper" , "Someone who makes snorting noises while asleep" , "Maker of raucous nocturnal sounds" .)