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Checks returning symptoms of measles (5)

Ross

I believe the answer is:

stops

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'checks' is the definition.
('stop' can be a synonym of 'check')

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for stops that I've seen before include "Ceases" , "Checks" , "Prevents" , "Halts" , "Ends" .)

I've seen this clue in The Globe and Mail.
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