Crossword Genius

World Federation of the ___ (group advocating for sign language rights) (4)

Ross

I believe the answer is:

deaf

(Other definitions for deaf that I've seen before include "Unable to pick up" , "Audibly challenged" , "like stone?" , "Deprived of the sense of hearing" , "Unhearing" .)

I've seen this clue in The Washington Post.
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