Heard things about decisions CID disregarded (6)
I believe the answer is:
noises
'heard things' is the definition.
(things which can be heard)
'about decisions cid disregarded' is the wordplay.
'about' indicates anagramming the letters.
'disregarded' indicates named letters should be taken away.
'decisions' with 'cid' taken away is 'esions'.
'esions' is an anagram of 'NOISES'.
(Other definitions for noises that I've seen before include "Sounds, rackets" , "Loud or harsh sounds" , "sounds unpleasant" , "Noses I turn up to sounds" , "Disturbing sounds" .)