Clue: Colder than Coventry for those sent into isolation? (7)
Answer: SIBERIA
Explanation: Definition: Colder than Coventry for those sent into isolation
 Cryptic defn: If one is "sent to Coventry", one would be treated coldly/ostracised. Being "sent to Siberia", is to be banished/to be sent into isolation, from when Russian criminals were literally sent into Siberia, a much colder and more remote region than Coventry, as their punishment.