Ice to glide audibly (4)
I believe the answer is:
floe
'ice' is the definition.
(thesaurus)
'glide audibly' is the wordplay.
'glide' becomes 'flow'.
'audibly' indicates a 'sounds like' (homophone) clue.
'flow' sounds like 'FLOE'.
'to' acts as a link.
(Other definitions for floe that I've seen before include "Separated piece of ice on water" , "Floating flat mass of ice" , "Frozen piece of Arctic" , "Comparatively small piece of floating ice" , "Piece of ice at sea" .)