Used to hear company invested in gold getting endless criticism (8)
I believe the answer is:
acoustic
'used to hear' is the definition.
I can't tell whether this defines the answer.
'company invested in gold getting endless criticism' is the wordplay.
'company' becomes 'co' (abbreviation).
'invested in' indicates putting letters inside.
'gold' becomes 'aus' (I am not sure about this - if you are sure you should believe this answer much more).
'getting' means one lot of letters go next to another.
'endless' means to look at the middle letters.
The middle letters of 'criticism' are 'tic'.
'co' going within 'aus' is 'acous'.
'acous'+'tic'='ACOUSTIC'
Can you help me to learn more?
(Other definitions for acoustic that I've seen before include "Like sound" , "Relating to hearing" , "Relating to sound/hearing" , "Of sound or the sense of hearing" , "Of the physical properties of sound" .)