One handling stock finding glimmer of hope in new mRNA vaccine cutting odds (8)

I believe the answer is:

ranchman

I'm a little stuck... Click here to teach me more about this clue!

But I can't explain it at all! Could you help me understand?

(Other definitions for ranchman that I've seen before include "Farmer" , "who takes stock?" .)

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.