Left in bloodstained triumph (5)
I believe the answer is:
glory
'triumph' is the definition.
(glorying is a kind of triumphing)
'left in bloodstained' is the wordplay.
'left' becomes 'l' (common abbreviation).
'in' means one lot of letters goes inside another.
'bloodstained' becomes 'gory' ('gory' can be a synonym of 'bloodstained').
'l' going inside 'gory' is 'GLORY'.
(Other definitions for glory that I've seen before include "Resplendent brightness" , "The Power and the . . . . . (Graham Greene)" , "Splendour - fame" , "celebrity" , "Honour, distinction" .)