Quite wrong about singular working dispute (8)
I believe the answer is:
question
'dispute' is the definition.
(thesaurus)
'quite wrong about singular working' is the wordplay.
'wrong' is an anagram indicator.
'about' indicates putting letters inside.
'singular' becomes 's' (abbreviation sometimes used in dictionaries).
'working' becomes 'on'.
'quite' anagrammed gives 'queti'.
'queti' going around 's' is 'questi'.
'questi'+'on'='QUESTION'
(Other definitions for question that I've seen before include "Grill" , "Query" , "Interrogative sentence" , "Ask; doubt" , ""To be or not to be", for example" .)