Stays on the surface of liquid (6)
I believe the answer is:
floats
'stays on the surface of liquid' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for floats that I've seen before include "Hovers" , "Rests or drifts on the surface" , "Remains on the surface of liquid" , "Rests or moves on the surface of liquid" , "Stays on the surface of water" .)