Crossword Genius

Royal residence's type of chair by shed, extremely large (7,6)

Ross

I believe the answer is:

windsor castle

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

'royal residence's' is the definition.
(I've seen this before)

'chair by shed extremely large' is the wordplay.
'chair by' becomes 'windsor' (Windsor chair is an example. I am not sure about the 'by' bit.**).
'shed' becomes 'cast' (I've seen this before).
'extremely' says to hollow out the word (remove centre letters).
'large' with its centre removed is 'le'.
'windsor'+'cast'+'le'='WINDSOR CASTLE'

'type of' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for windsor castle that I've seen before include "royal house" , "Queen's residence" , "Royal residence" , "palace" .)

I've seen this clue in The Times.
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