Possible Clues:

• Large aquatic mammal — sea cow
• Denizen of Florida's Crystal River
• Sea cow of tropical Atlantic coasts and estuaries
• Marine creature mum has eaten -- horrible!
• Huge marine mammal
• Everglades cousin of the elephant
• Chap dined on Eastern sea creature
• Sea cow — emanate (anag)
• Sea cow's sexual partner crossing an estuary at first
• Perhaps work at an area for drivers and water animal