Teach about gold castle abroad (7)

I believe the answer is:

chateau

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'castle abroad' is the definition.
'chateau' can be an answer for 'castle' (I've seen this before). I'm not sure about the 'abroad' bit.

'teach about gold' is the wordplay.
'about' indicates anagramming the letters.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'teach' is an anagram of 'chate'.
'chate'+'au'='CHATEAU'

Can you help me to learn more?

(Other definitions for chateau that I've seen before include "Large French country house" , "Impressive French building" , "French country home" , "Impressive dwelling in France" , "Kind of fine wine from the Bordeaux region" .)

I've seen this clue in The Daily Express.

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