Crossword Genius

Supposedly brave greeting? (3)

Ross

I believe the answer is:

how

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'greeting?' is the definition.
(greeting used by some Native Americans)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for how that I've seen before include "See 16" , "In what manner or method?" , "By what means?" , "In what way?" , "Who (anag.)" .)

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