company stationery (10)
I believe the answer is:
letterhead
'company stationery' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for letterhead that I've seen before include "Where name and address are shown" , "Heading on stationery" , "Preprinted name, address etc at top of notepaper" , "Address, name etc printed at top of notepaper" , "Printed address on stationery" .)