Powerball game (5)
I believe the answer is:
lotto
'powerball game' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lotto that I've seen before include "Game in which numbers are drawn" , "Venetian painter - gambling game" , "Children's game; lottery" , "form of gambling" , "National game with large money prizes" .)