Shortly rest, wandering around cathedral city (7)
I believe the answer is:
tersely
'shortly' is the definition.
(thesaurus)
'rest wandering around cathedral city' is the wordplay.
'wandering around' indicates anagramming the letters (I've seen this in other clues).
'cathedral city' becomes 'ely' (I've seen this before).
'rest' anagrammed gives 'ters'.
'ters'+'ely'='TERSELY'
(Other definitions for tersely that I've seen before include "In a short and concise manner" , "In a short or curt manner" , "In an abrupt manner" , "using few words" , "Abruptly" .)