Crossword Genius

Your Highness? (8)

Ross

I believe the answer is:

altitude

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'highness?' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

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(Other definitions for altitude that I've seen before include "Height (above ground)" , "Height, elevation" , "high place" , "Lofty position" , "Loftiness" .)

I've seen this clue in The Sun.
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