Half of jury's entertained by stint in Winter Olympics event (3,4)
I believe the answer is:
ski jump
'winter olympics event' is the definition.
(I've seen this in another clue)
'half of jury's entertained by stint' is the wordplay.
'half of' suggests halving the letters.
'entertained by' means one lot of letters goes inside another (inserted letters are hosted or entertained).
'stint' becomes 'skimp' (synonyms).
'jury' halved is 'ju'.
'ju' going into 'skimp' is 'SKI-JUMP'.
'in' acts as a link.
(Other definitions for ski jump that I've seen before include "Event at winter Olympics" , "Winter sports slope" , "Winter sports activity" , "Icy runway" , "Leap over snow" .)