Dispute involving sweet being included in a payment (8)
I believe the answer is:
argument
'dispute' is the definition.
(I know that argument is a type of dispute)
'sweet being included in a payment' is the wordplay.
'sweet' becomes 'gum' (gum is a kind of sweet).
'being included in' indicates putting letters inside.
'payment' becomes 'rent' (rent is a kind of payment).
'a'+'rent'='arent'
'gum' placed inside 'arent' is 'ARGUMENT'.
'involving' acts as a link.
(Other definitions for argument that I've seen before include "Line of reasoning" , "Discussion - line of proof" , "Heated exchange" , "Contentious debate" , "Altercation" .)