Crossword Genius

This may stop one from getting off (8)

Ross

I believe the answer is:

insomnia

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'this may stop' is the definition.
The answer and definition can be both states of affairs as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for insomnia that I've seen before include "Habitual inability to sleep (8)" , "problem at night" , "Condition affecting sleep" , "In restless state" , "State of chronic sleeplessness" .)

I've seen this clue in The Telegraph.
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