Restful little part of the country (4)
I believe the answer is:
beds
'restful little part of the country' is the definition.
I can't tell whether this defines the answer.
'part of the country' is the wordplay.
'part' becomes 'bed' (bed is a kind of part).
'of the country' becomes 's' (I am not sure about this - if you are sure you should believe this answer much more).
'bed'+'s'='BEDS'
Can you help me to learn more?
(Other definitions for beds that I've seen before include "borders" , "Garden plots -- English country (abbr)" , "Garden plots - English county (abbr)" , "Graduate teacher's" , "area that includes Luton" .)