Beginner entering bloodstained splendour (5)
I believe the answer is:
glory
'splendour' is the definition.
(I've seen this before)
'beginner entering bloodstained' is the wordplay.
'beginner' becomes 'l'.
'entering' means one lot of letters goes inside another.
'bloodstained' becomes 'gory' ('gory' can be a synonym of 'bloodstained').
'l' going within 'gory' is 'GLORY'.
(Other definitions for glory that I've seen before include "The Power and the . . . . . (Graham Greene)" , "Delight" , "Radiant beauty" , "Splendour - fame" , "Magnificence" .)