Clue: Need religious correspondent to remove line on possible cathedral location (7)
Answer: PAUCITY
Explanation: Definition: Need
 "Paul"(religious correspondent/writer of the Epistles/Letters of Paul, some of the books in the New Testament of the Bible) **minus**(to remove) "l"(abbrev. for "line") **plus**(on) CITY(a town created a city by charter, and usually containing a cathedral/a possible cathedral location).
Defn: …/a lack of.