Possible Clues:

• Gas across battlefield becomes mourning symbol
• Tree that sounds like a country
• An evergreen
• Constant battle getting capital to save large plant
• City crowd loses it, mourning symbol
• As example of 27, it must be removed from city newspapers
• Evergreen comedy lacking interior force
• Battle to fill outer parts of Christmas tree
• Tree from Mediterranean island, I hear
• That tree will end as newspaper