Crossword Genius

Rise in waves (6)

Ross

I believe the answer is:

billow

(Other definitions for billow that I've seen before include "Wave; upward flow" , "Swell out (as a sail)" , "Swell out, as a flag" , "Become inflated; rise up, as in waves" , "Surge" .)

I've seen this clue in The Irish Times.
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