14 across
Open
to
the
elements,
caps
missing,
air
processor
burned
(8)
Open to the elements, caps missing, air processor burned (8)
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The definition is at the beginning of the clue.
How the clue works
Open to the elements is the definition, as an unglazed window lets the weather in. Take LUNG (an air processor) and BLAZED (burned), then knock off their opening letters — the "caps missing" — to leave UNG and LAZED, which run together to spell the answer.