Still writing stuff, by the sound of it (10)
I believe the answer is:
stationary
'still' is the definition.
(thesaurus)
'writing stuff by the sound of it' is the wordplay.
'writing stuff' becomes 'stationery'.
'by the sound of it' indicates a 'sounds like' (homophone) clue.
'stationery' is a homophone of 'STATIONARY'.
(Other definitions for stationary that I've seen before include "Static" , "Not moving" , "Parking" , "Unmoving" , "Still" .)