After vermin passed up on crop, you would become radiantly happy (6,4)

I believe the answer is:

starry-eyed

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

I've seen this clue in The Times.

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