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Stratospheric – or uncertain? (2,2,3,3)

Ross

I believe the answer is:

up in the air

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This might be a double definition.

'stratospheric' is the first definition.
Both the answer and definition are adjectives.
Maybe you can see an association between them that I don't see?

'uncertain?' is the second definition.
('up in the air' can be similar in meaning to 'uncertain')

'or' acts as a link.

Can you help me to learn more?

(Other definitions for up in the air that I've seen before include "Balloonist is" , "Not yet settled" , "Where skiers go" , "undecided" , "position of hawk or dove?" .)

I've seen this clue in The Everyman puzzle in The Observer.
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