Keys to resting place (3)

I believe the answer is:

bed

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'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" .)

I've seen this clue in The Mirror.

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