Restful little county (4)
I believe the answer is:
beds
'county' is the definition.
(abbreviation for Bedfordshire)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for beds that I've seen before include "Small English county" , "Cots, bunks etc -- eastern English county (abbr)" , "Dormitory items" , "Garden plots -- English country (abbr)" , "County (abbr.); sleeping places" .)