Assume Etonian hosts sporting event (4)
I believe the answer is:
meet
'sporting event' is the definition.
(I've seen this in another clue)
'assume etonian hosts' is the wordplay.
'hosts' indicates the answer is hidden within the clue.
'MEET' is hidden within 'assume etonian'.
(Other definitions for meet that I've seen before include "Hunting gathering" , "assembly at hunt" , "It is proper to encounter" , "Assemble" , "Fitting - encounter" .)