Party bringing action with ugly fight (9)
I believe the answer is:
plaintiff
'party' is the definition.
(I know that plaintiff is a type of litigant)
'with ugly fight' is the wordplay.
'with' says to put letters next to each other.
'ugly' becomes 'plain' (I've seen this before).
'fight' becomes 'tiff' (tiff can mean an argument).
'plain'+'tiff' is 'PLAINTIFF'.
'bringing action' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for plaintiff that I've seen before include "Former litigant" , "accusing person in suit" , "he goes to court" , "One brings a legal case against another" , "One bringing a lawsuit" .)