Queen seen in banner (4)
I believe the answer is:
anne
'queen' is the definition.
(Queen Anne, 18th-century queen)
'in banner' is the wordplay.
'in' says the answer is hidden in the clue.
'ANNE' is hidden in the letters of 'banner'.
'seen' acts as a link.
(Other definitions for anne that I've seen before include "Queen, daughter of James II" , "'---- of Green Gables', novel by Lucy Maud Montgomery" , "- - Hathaway, wife of Shakespeare" , "Henry's second" , "English queen" .)