Crossword Genius

Disease of solvers picked up (4)

Ross

I believe the answer is:

yaws

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'disease' is the definition.
(yaws is a kind of health problem)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for yaws that I've seen before include "Deviates" , "Moves unsteadily" , "Goes off course (ship); tropical disease" , "At sea - isn't following straightforward course" , "course changes" .)

I've seen this clue in The Independent.
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