Crown duke media exploited (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
diadem
'crown' is the definition.
(I've seen this before)
'duke media exploited' is the wordplay.
'duke' becomes 'd'.
'exploited' indicates anagramming the letters.
'media' is an anagram of 'iadem'.
'd'+'iadem'='DIADEM'
(Other definitions for diadem that I've seen before include "Crown or headband worn as sign of sovereignty" , "Ornamental jewelled headdress" , "Small jewelled crown" , "Tiara" , "Light crown" .)