Describes voters not committed to any party (8)
I believe the answer is:
floating
'describes voters not committed to any party' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for floating that I've seen before include "Describes voters not committed to any party" , "Supported by water" , "Voters not committed to party or policy" , "Suspended in a liquid" , "Drifting on top of a liquid surface" .)