Illuminated soldier returned, forced into a lawsuit (10)
I believe the answer is:
litigation
'lawsuit' is the definition.
(thesaurus)
'illuminated soldier returned forced into a' is the wordplay.
'illuminated' becomes 'lit' (synonyms).
'soldier' becomes 'gi' (term for US soldier).
'returned' says the letters should be written in reverse.
'forced' indicates anagramming the letters.
'gi' back-to-front is 'ig'.
'into'+'a'='intoa'
'intoa' is an anagram of 'ation'.
'lit'+'ig'+'ation'='LITIGATION'
(Another definition for litigation that I've seen is " Lawsuit, legal action".)