Three keys to resting-place (3)
I believe the answer is:
bed
'place' is the definition.
(bedding is a kind of placing)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for bed that I've seen before include "Firmly settle" , "Plot in which plants are growing" , "Matrimonial duties" , "Bottom of the sea or river" , "In which to place the body of flowers" .)