Restful time, as organised by British city (7)
I believe the answer is:
sabbath
'restful time' is the definition.
The answer and definition can be both related to time as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'as organised by british city' is the wordplay.
'organised' is an anagram indicator.
'by' says to put letters next to each other.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'city' becomes 'bath' (English city).
'as' anagrammed gives 'sa'.
'sa'+'b'+'bath'='SABBATH'
Can you help me to learn more?
(Other definitions for sabbath that I've seen before include "Traditional holy day" , "Period of rest" , "Religious day of rest for Jews and Christians" , "Day of rest and worship" , "Hebrew word for day of rest" .)