Material moved to and fro, so we hear (5)
I believe the answer is:
suede
'material' is the definition.
(I know that suede is a type 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' sounds like '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" .)