Cover something worth saving (4)
I believe the answer is:
hide
'cover' is the definition.
(hide is a kind of cover)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for hide that I've seen before include "Keep out of sight" , "Not show" , "Flog" , "mask" , "Conceal - skin" .)