Cube among ingredients (3)
I believe the answer is:
die
'cube' is the definition.
(die is a kind of cube)
'among ingredients' is the wordplay.
'among' indicates a hidden word.
'DIE' can be found hidden inside 'ingredients'.
(Other definitions for die that I've seen before include "Perish" , "Stamping device" , "One spotted" , "Stop functioning" , "Cease to exist" .)