Defeat later remedied in court (8)
I believe the answer is:
waterloo
'defeat' is the definition.
(I know that waterloo is a type of defeat)
'later remedied in court' is the wordplay.
'remedied' indicates anagramming the letters.
'in' is an insertion indicator.
'court' becomes 'woo' (both can mean to romance someone).
'later' is an anagram of 'aterl'.
'aterl' put within 'woo' is 'WATERLOO'.
(Other definitions for waterloo that I've seen before include "Meet one's - -" , "19th century battle" , "Decisive defeat" , "Belgian battle site" , "Losers may meet theirs" .)