Fixture ends in drubbing: Chelsea team sublime (4)
I believe the answer is:
game
'fixture' is the definition.
(sporting fixture)
'ends in drubbing chelsea team sublime' is the wordplay.
'ends in' indicates one should take the final letters.
The final letters of 'drubbing chelsea team sublime' are 'GAME'.
(Other definitions for game that I've seen before include "Final declaration of tennis result - . . . ., set and match" , "Competitive diversion" , "Creatures killed for sport" , "Something to play or to chase" , "Hunted wildlife" .)