No cleric will come back to a foreign city (6)
I believe the answer is:
verona
'foreign city' is the definition.
(Verona is an Italian city)
'no cleric will come back to a' is the wordplay.
'cleric' becomes 'rev' (abbreviation for Reverend).
'will come back' says the letters should be written in reverse.
'no'+'rev'='norev'
'norev' written backwards gives 'veron'.
'veron'+'a'='VERONA'
(Other definitions for verona that I've seen before include "City of Romeo and Juliet near Averno" , "Italian city, home of Romeo and Juliet" , "Romeo and Juliet's city" , "Where 27 [MERCUTIO] was killed" , "The Two Gentlemen of ___ (Shakespeare)" .)