Argument coming back I’d got terribly upset by (7)
I believe the answer is:
dispute
'argument' is the definition.
(thesaurus)
'got terribly upset by' is the wordplay.
'got' becomes 'di' (I can't justify this - if you can you should give a lot more credence to this answer).
'terribly' indicates anagramming the letters.
'by' says to put letters next to each other.
'upset' is an anagram of 'spute'.
'di'+'spute'='DISPUTE'
'coming back i'd' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for dispute that I've seen before include "Argument, contention" , "conflict" , "Row" , "Altercation" , "Question or deny accuracy or validity" .)