Clue: Chocolate treat an islander's 7 runs after (8)
Answer: MALTESER
Explanation: Definition: Chocolate treat
MALTESE (type of terrier) + R, and two definitions: chocolate treat and islander (Chambers doesn't give malteser= person from Malta, but I'm sure I've seen it used. *Or possibly it's just "islander's 7" to define the terrier**)