Pennon (8)
I believe the answer is:
streamer
'pennon' is the definition.
(I know that pennon can be written as streamer)
This is all the clue.
(Other definitions for streamer that I've seen before include "Long decorative strip of material" , "Ribbon - bad cold?" , "Banner headline; long strip" , "Long flag, often tapering" , "Paper ribbon - thin flag" .)