Related Clues:

• Comprehensible
• Like a day with blue skies
• Smogless
• Spelled-out
• Free partner
• "C" on a calculator
• Air condition?
• Unambiguous
• Like good explanations
• Weather forecast, at times
• Unblocked
• Not obstructed
• "It Came Upon a Midnight ___"
• Transparent and lucid
• Free from obstruction