Porcelain cap (hat in America) (5,5)

I believe the answer is:

crown derby

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

'cap hat in america' is the wordplay.
'cap' becomes 'crown' ('crown' can be a synonym of 'cap').
'hat in america' becomes 'derby' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'crown'+'derby'='CROWN DERBY'

Can you help me to learn more?

(Other definitions for crown derby that I've seen before include "China? - with 22a" , "Service" , "Brand of china" , "type of porcelain" , "Kind of porcelain" .)

I've seen this clue in The Telegraph.

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