Crossword Genius

Staunchly promises (6)

Ross

I believe the answer is:

swears

(Other definitions for swears that I've seen before include "Curses or pledges" , "Takes oath or curses" , "Quite (mus.); a female voice" , "Takes oath or utters imprecation (6)" , "Blinds" .)

I've seen this clue in The Wall Street Journal.
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