Crossword Genius

"Who'da thunk it!" (3)

Ross

I believe the answer is:

gee

(Other definitions for gee that I've seen before include "Mild exclamation" , "- - whiz! (US)" , "Exclamation of surprise" , "Wow!" , "Gosh" .)

I've seen this clue in The Washington Post and the USA Today.
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