Royal house described in words (7)

I believe the answer is:

windsor

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

'royal house' is the definition.
(Windsor is an example)

'described in words' is the wordplay.
'in words' can be anagrammed to 'WINDSOR'.
However, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for windsor that I've seen before include "somewhere in Berkshire" , "Town with royal castle" , "Chair < for house" , "British royal house" , "Royal castle; a tie knot" .)

I've seen this clue in The Globe and Mail.

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