Possible Clues:

• Mosquitoes, to bats
• Zebra, to a lion
• Any hunted animal
• Part of a food chain
• Hunter's quest
• 'What the victim may do, by the sound of it, before 12 across (4)'
• Quarry, victim
• Game
• 7-Across, to an aardvark
• Worms, to robins