Material moved to and fro, so we hear (5)
I believe the answer is:
suede
'material' is the definition.
(suede is a kind of material)
'moved to and fro so we hear' is the wordplay.
'moved to and fro' becomes 'swayed' (to sway is to move to and fro).
'so we hear' shows a homophone (sound like).
'swayed' is a homophone of 'SUEDE'.
(Other definitions for suede that I've seen before include "unprepared material" , "Leather with velvety nap used in shoes and clothes" , "Soft leather with one side napped" , "Soft goatskin" , "leather material" .)