As one who sees things looking up? (6-4)

I believe the answer is:

starry-eyed

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'up?' is the definition.
Both the answer and definition are adjectives. Maybe there's a link between them I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for starry-eyed that I've seen before include "Naively enthusiastic" , "Out of touch with reality" , "Romantically optimistic" , "Full of unsophisticated optimism" , "Naively idealistic" .)

I've seen this clue in The Guardian.

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