(transitive) To tidy up, to remove mess or obstacles from a place to make it neat. / (intransitive) To leave, disappear / (transitive, figuratively) To dispose of, to get rid of, to remove.

In a crystal clear manner

crystal clear

(archaic) Boards, planks, etc., that are free of knots.

(military) A temporary field hospital to treat and classify the sick and wounded.

plural of clearing station

(law, of a possession) In a condition of lawful outright ownership, without restrictions or encumbrances. / (law, of a person) Possessing such lawful outright ownership.

In a clear and easily understandable manner.

(idiomatic) There is no danger; one can freely pass through a region without risk of discovery.

(simile) Quite clear.