Plan for bed (4)
I believe the answer is:
plot
This clue is a double definition.
'plan' is the first definition.
(plot is a kind of plan)
'bed' is the second definition.
(I've seen this before)
'for' acts as a link.
(Other definitions for plot that I've seen before include "Patch of ground" , "Scheme, story and piece of ground" , "Secret plan; graph" , "The story told in a novel" , "Scheme; graph" .)