clear (see-through) / clear (understandable) / light (having a light shade, not dark)

clearly

light

(of a person) (transitive with sur or avec) clear (free of doubt, who has understood the situation clearly)

simply put, in brief

(art) chiaroscuro

crystal clear, clear-cut, cut-and-dried, loud and clear, no ifs or buts

(fencing) with sword drawn (with the sword out of its sheath) / (literary, figuratively) in an openly aggressive and forthright manner

Earthshine (reflected Earthlight)

(transitive) to clear up; shed light on; to set straight