Possible Clues:

• The old song urges to ''let a smile be your ...''
• Canopy that casts shadow over more than a yard
• Wandering around Mull, bear this?
• Shelter mare with bull? -- that's irregular
• Protection from rains English learners had in unsettled Burma
• What goes up when rain comes down?
• Unusual rum label covering a lot of things
• Sounds like it's ages but it'll keep you dry
• Measure introduced in Burma somehow gives protection
• Sidewalk cafe sight