Standard of France in ruined memorial (9)
I believe the answer is:
oriflamme
'standard' is the definition.
(thesaurus)
'france in ruined memorial' is the wordplay.
'france' becomes 'f'.
'in' indicates putting letters inside.
'ruined' is an anagram indicator.
'memorial' is an anagram of 'orilamme'.
'f' placed into 'orilamme' is 'ORIFLAMME'.
'of' acts as a link.
(Other definitions for oriflamme that I've seen before include "Knight's standard (hist.)" , "Banner" , "French flag" .)