Drifting sheet of frozen water (7)
(Other definitions for ice floe that I've seen before include "Frozen floating object" , "Floating mass of frozen water" , "Cold sheet" , "Floating sheet formed from glacier" , "Large sheet of frozen water" .)
(Other definitions for ice floe that I've seen before include "Frozen floating object" , "Floating mass of frozen water" , "Cold sheet" , "Floating sheet formed from glacier" , "Large sheet of frozen water" .)