### Clue: Jack, given wrong date, lowered (6)
### Answer: ABATED 
 ### Explanation: Definition: lowered
  AB(abbrev. for able-bodied seaman,sailor,Jack or Jack Tar – Rufus's trademark inclusion of a nautical reference) **plus**(given) **anagram of**(wrong) DATE.
Answer: Decreased,lowered in intensity, volume, etc.