Experience heavy blow, as would Oscars attendee? (3,5)
I believe the answer is:
see stars
'experience heavy blow' is the definition.
(you might see stars after being hit)
I cannot understand how the rest of the clue works.
(Other definitions for see stars that I've seen before include "Look dazed" , "affected by flashing lights" , "suffer as a result of a strike?" , "You may after whack on the head" , "as one may on beautiful night" .)