Comfort, rest (4)
I believe the answer is:
ease
This clue is a double definition.
'comfort' is the first definition.
(I know that comfort can be written as ease)
'rest' is the second definition.
(synonyms)
(Other definitions for ease that I've seen before include "Effortlessness" , "composure" , "nonchalance!" , "Comfort; facility" , "Free from pain" .)