Bits & Pieces

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Solve 4 / 5 clues to proceed.

Part of major US airline group to help drinkers construct battery (3)
Korean electronics company, incidentally, drops winner recalling test of intellect with perfect score for rainbow community? (8)
One billionth of first four of 30 days to write (4)
A restaurant chain displays half of a television animation extension (4)
Common quarantine status on Wednesday, Friday, and Thursday, but not Tuesday (3)