Decorative -- possibly late Norman (10)
I believe the answer is:
ornamental
'decorative' is the definition.
('ornamental' can be a synonym of 'decorative')
'possibly late norman' is the wordplay.
'possibly' indicates anagramming the letters.
'late'+'norman'='latenorman'
'latenorman' is an anagram of 'ORNAMENTAL'.
(Other definitions for ornamental that I've seen before include "Decorative" , "Plant grown for attractive appearance" , "showy" , "Fancy" , "non-functional" .)