Rider of a black horse named Tornado (5)

I believe the answer is:

zorro

(Other definitions for zorro that I've seen before include "Tyrone Power & Anthony Hopkins film role" , "Swashbuckling hero" , "Fictional masked outlaw" , "Doglike fox" , "Spanish for 'fox' giving name to a fictional aristocratic outlaw of old California" .)

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

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