Stop start?

I think it could be either:

Which length description are you looking for?:

non

'stop start?' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for non that I've seen before include "- - -stick" , "Combining form meaning not" , "Negative French word" , "Prefixed negation of a word" , "Prefix meaning not or none" .)

I've seen this clue in The New York Times.

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