Remote possibility (7,6)

I think it could be either:

Which length description are you looking for?:

3-6

7,6

outside chance

'remote possibility' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for outside chance that I've seen before include "It might just happen" , "one at long odds" , "smallest likelihood" .)

I've seen this clue in The Times.

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