Charles III's house (7)

I believe the answer is:

windsor

(Other definitions for windsor that I've seen before include "Family name replacing Saxe-Coburg-Gotha in 1917" , "Royal palace" , "Town with royal castle" , "Royal castle; a tie knot" , "Knot type; royal castle" .)

I've seen this clue in the King Feature Syndicate.

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