Ring back and make a disdainful sound (4)
I believe the answer is:
pooh
'sound' is the definition.
(I have seen 'Impatient sound' mean 'pooh' so perhaps 'sound' could also mean 'pooh')
'ring back' is the wordplay.
'ring' becomes 'hoop' (synonyms).
'back' shows that the letters should be reversed in order.
'hoop' written backwards gives 'POOH'.
'and make a disdainful' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for pooh that I've seen before include "from one bothered by long words" , "Honey-loving bear" , "that smells horrible" , "4 - expression of disgust" , "Literary bear" .)