Does this sentence make sense?
x: Let the sky clear out a bit before you go to work.
Let’s say it was pouring and the wife doesn’t want her husband to just yet because it can be dangerous. Would you say “let it clear out” or let it clear off”?
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As the Cambridge Dictionary tells,
— phrasal verb with clear verb
to leave a place:
I hear Daphne's finally told her husband to clear out (= to leave home).
My landlord's given me a week to clear out of my flat.
It is somewhat strange to tell the sky to get out of somewhere or to go away, so the best option here is to probably leave "clear" verb alone, and it will sound perfectly fine:
x: Let the sky clear a bit before you go to work.
Hope that helps!