6 down
Lack
of
wind
in
local
mountains
(4)
Lack of wind in local mountains (4)
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The definition is at the beginning of the clue.
How the clue works
The definition is Lack of wind — you're after a word meaning stillness or absence of a breeze. It's hiding right there inside "loCAL Mountains", with in tipping you off that the answer's tucked inside the phrase.