Major Bloodnok hosts ball (3)
I believe the answer is:
orb
'ball' is the definition.
('orb' can be a synonym of 'ball')
'major bloodnok hosts' is the wordplay.
'hosts' says the answer is hidden in the clue.
'ORB' is hidden within 'major bloodnok'.
(Other definitions for orb that I've seen before include "Jewelled ornament" , "Ceremonial globe carried by a monarch" , "Ring" , "Ornamental globe" , "Item of insignia" .)