Day of rest and worship (7)
I believe the answer is:
sabbath
'day of rest and worship' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sabbath that I've seen before include "Period of rest" , "Sacred day of the week" , "Day of rest and worship" , "Traditional holy day" , "Religious day of rest for Jews and Christians" .)