Black queen with right flag (6)
I believe the answer is:
banner
'flag' is the definition.
(I know that banner is a type of flag)
'black queen with right' is the wordplay.
'black' becomes 'b' (as in pencil classifications).
'queen' becomes 'anne' (Queen Anne, 18th-century queen).
'with' means one lot of letters go next to another.
'right' becomes 'r' (common abbreviation).
'b'+'anne'+'r'='BANNER'
(Other definitions for banner that I've seen before include "Military standard" , "Streamer, flag" , "protester's statement?" , "It may be seen on demo" , "Flag used as standard" .)