__ and Clark expedition (5)

I believe the answer is:

lewis

(Other definitions for lewis that I've seen before include "our 1/4 Across [GOLD MEDALLIST] in 2000" , "gunman?" , "Charles Dodgson's pen name" , "Police sergeant" , "Scots isle" .)

I've seen this clue in the Newsday.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.