Ice cream concoctions (6)
I believe the answer is:
'ice cream concoctions' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for floats that I've seen before include "Rests or drifts on the surface" , "Hovers" , "Remains on the surface of liquid" , "Stays on the surface of liquid" , "Carnival wagons" .)