Crossword Genius

From the new char poor Leo caught the disease (7)

Ross

I believe the answer is:

cholera

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'disease' is the definition.
(cholera is a kind of disease)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for cholera that I've seen before include "Contagious disease" , "Disease caught from contaminated water" , "Solemn promise" , "Acute infection caused by contaminated water or food" , "Disease contracted from infected water" .)

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