Possible Clues:

• Tusked beast
• Animal’s name the panel worked out
• Mammal to help out after bearing insect
• Turbulence in the plane: Jumbo?
• A white one's useless (and expensive)
• Room occupant, in an idiom
• Fantastic plane, the jumbo!
• Simple and effective coat of polish for grand trunk -- and its owner?
• The plane in flight, a jumbo
• From Nepal, the wild animal