Clue: Silver service's passed round for youth (6)
Answer: NONAGE
Explanation: Silver service's passed round for youth (6)
**Ag **(chemical symbol for "silver") with **NONE **("service") "passed around" it. 
Not being of a religious persuasion, I had to check NONE, and it is apparently the fifth of the seven canonical hours, or the service for it, originally fixed for the ninth hour of the day (or 3 p.m.).