Gambler's cubes (4)
I believe the answer is:
dice
'gambler's cubes' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dice that I've seen before include "Gaming cube(s)" , "Numbered cube(s)" , "Small cube" , "Cubes used in gambling" , "Cut into small cubes" .)