Ensign; flag (6)
I believe the answer is:
banner
I believe this is a double definition.
'ensign' is the first definition.
(I've seen this in another clue)
'flag' is the second definition.
(I know that banner is a type of flag)
(Other definitions for banner that I've seen before include "One not allowing" , "Military standard" , "Pennant" , "Web page header; flag" , "Prohibitionist - flag" .)