Gas outage every so often set back big house abroad (7)

I believe the answer is:

chateau

I'm a little stuck... Click here to teach me more about this clue!

'back big house abroad' is the definition.
I can't tell whether this definition defines the answer.

'gas outage every so often set' is the wordplay.
'gas' becomes 'chat' (both can mean to talk).
'every so often' means one should take alternating letters.
'set' indicates anagramming the letters (instruction to set the letters).
The alternating letters of 'outage' are 'uae'.
'uae' anagrammed gives 'eau'.
'chat'+'eau'='CHATEAU'

Can you help me to learn more?

(Other definitions for chateau that I've seen before include "French country home" , "Country residence" , "Loire Valley attraction" , "Castle, especially in France" , "French wine producer" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.