Crossword Genius

Faithful to sides exchanged. It’s majestic! (5)

Ross

I believe the answer is:

royal

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'majestic' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for royal that I've seen before include "With kingly status" , "Kingly or queenly" , "Relating to kings/queens" , "Queen, say?" , "August" .)

I've seen this clue in The Hindu.
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