I'm surprised one finally bought opulent headwear (7)

I believe the answer is:

coronet

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'headwear' is the definition.
(I've seen this before)

'i'm surprised one finally bought' is the wordplay.
'i'm surprised' becomes 'cor' (old-fashioned UK expression of shock or awe).
'finally' suggests the final letters.
The last letter of 'bought' is 't'.
'cor'+'one'+'t'='CORONET'

'opulent' acts as a link.
This may not be correct. It may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for coronet that I've seen before include "Headwear" , "Peer's headgear" , "Diadem" , "emblem of rank" , "topping item of jewellery" .)

I've seen this clue in The Times.

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