Duck and cover, but not towards the ground! (5)
I believe the answer is:
eider
'duck' is the definition.
(eider is a type of duck)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for eider that I've seen before include "Source of fine soft down" , "Sea duck with soft down" , "I've noted down" , "Breed of duck" , "Downy sea duck" .)