Keys to resting place (3)
I believe the answer is:
bed
'resting place' is the definition.
(where you can sleep or rest)
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 "pit" , "Sleeping place" , "Firmly settle" , "Plot in which plants are growing" , "Bottom of the sea or river" .)