Hypochondriac finally back to bed (3)
I believe the answer is:
cot
'bed' is the definition.
(cot is a type of bed)
'hypochondriac finally back to' is the wordplay.
'finally' says to take the final letters.
'back' says the letters should be written backwards.
The final letter of 'hypochondriac' is 'c'.
'to' written backwards gives 'ot'.
'c'+'ot'='COT'
(Other definitions for cot that I've seen before include "Folding bed - fingerstall" , "Small child's bed" , "Crib" , "Infant's bed" , "Function" .)