Which one would you say?

Solution 1:

As the Cambridge Dictionary tells,

clear out

— phrasal verb with clear verb

informal

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.

(https://dictionary.cambridge.org/dictionary/english/clear-out)

That is, the meaning is similar to "go away" or "get out". Also googling gives exactly the same result:

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!