The term 'Plain as Day' is an idiom that means something is obvious or easily understood. The crossword solutions for this term are CLEAR (5 letters), OVERT (5 letters), PATENT (6 letters), EVIDENT (7 letters), and CLEARCUT (8 letters). All of these words have similar meanings, with CLEAR meaning easily seen or understood, OVERT meaning open or not hidden, PATENT meaning obvious or easily seen, EVIDENT meaning clearly visible, and CLEARCUT meaning unmistakable or obvious. Together, these words all emphasize the idea that something is plain as day, or easily understood.