It's bright and cold and you get up only with difficulty (6)

I believe the answer is:

clever

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'it's bright' is the definition.
(bright can mean clever or intelligent)

I don't understand how the remainder of the clue works.

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(Other definitions for clever that I've seen before include "Smar and canny" , "Quick at learning and understanding" , "easy to teach?" , "Skilful, adroit" , "expert" .)

I've seen this clue in the Evening Standard.

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