Possible Clues:

• River creature, almost exhausted, has to fish around
• Reptile of crocodile family from tropical America
• Pogo:Possum::Albert:---
• Every one gets a gun or reptile will appear
• Crack, as old paint
• Reptile like a crocodile
• Pear found in the tropical river?
• From fearsome beast, everyone needs one sound leg-protection
• Dope producing such a morning-after feeling?
• A Red one finished first in the 1968 Grand National