Reporter's still writing material? (10)
I believe the answer is:
stationery
'writing material?' is the definition.
(I've seen this before)
'reporter's still' is the wordplay.
'reporter's' indicates a 'sounds like' (homophone) clue (report can mean to speak something aloud).
'still' becomes 'stationary' (both can mean immobile).
'stationary' is a homophone of 'STATIONERY'.
(Other definitions for stationery that I've seen before include "The papers, etc" , "Pens, pencils, paper etc" , "Materials needed for writing" , "Various items in paper" , "Writing material" .)