### Clue: Stop tailless pet's sign of affection outside comprehensive (8)
### Answer: CATHOLIC 
 ### Explanation: Definition: comprehensive
 HO(or whoa!, signalling a horse to stop) **contained in**(… outside) "cat lick"(a sign of affection by your pet cat) **minus ****its last letter**(tailless …).
Defn: …/all-embracing.