Possible Clues:

• Cabbages or kings
• Like 'cats,' but not 'cat'
• "Mice" or "lice," but not "rice"
• Public library interrupted by oddly loud roar, or roars perhaps?
• Like 'geese' but not 'goose'
• More than one chum swallowing bait, briefly
• Not singular, grammatically
• Composed of more than one
• Like 'mice' but not 'mouse'
• Like many nouns ending in "s"