I'd made different headdress (6)
I believe the answer is:
diadem
'headdress' is the definition.
(I know that diadem is a type of crown)
'i'd made different' is the wordplay.
'different' indicates anagramming the letters (letters placed in a different order).
'id'+'made'='idmade'
'idmade' with letters rearranged gives 'DIADEM'.
(Other definitions for diadem that I've seen before include "Jewelled headband" , "headwear" , "Royal crown" , "Tiara" , "Crown or similar adornment" .)