Crossword Genius

Hero (4)

Ross

I think it could be either:

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3

4

sub

'hero' is the definition.
(I know that hero can be written as sub)

This is the entire clue.

(Other definitions for sub that I've seen before include "Vehicle in water" , "Navy vessel" , "Briefly, membership fee or stand-in" , "Contribution; a boat" , "Loan" .)

I've seen this clue in The Wall Street Journal and the LA Times.
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