Advocate spending week in bed (5)
I believe the answer is:
layer
'bed' is the definition.
(I know that bed can be written as layer)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for layer that I've seen before include "plate?" , "Single thickness and hen" , "Productive chicken" , "One supplying eggs" , "One of several thicknesses" .)