Disease of solvers picked up (4)
I believe the answer is:
yaws
'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" .)