Crossword Genius

*Renewable energy source . . . and the end of the word ladder (4)

Ross

I believe the answer is:

wind

(Other definitions for wind that I've seen before include "trade, for example" , "Some musicians" , "Twist or turn (in course)" , "Gust, e.g." , "Turn; current" .)

I've seen this clue in The New York Times.
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