Crossword Genius

The sky? (5)

Ross

I think it could be either:

Which length description are you looking for?:

5

9

'the sky?' is the definition.
(thesaurus)

This is the entire clue.

(Other definitions for limit that I've seen before include "Point beyond which one should not go" , "Outer extent" , "Restrict - term" , "Breaking point" , "Restrict - boundary" .)

I've seen this clue in the Evening Standard.
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