Related Clues:

• See 6-Down
• Get hoary
• Sciences' partner
• What candles may signify
• The 'A' of N.E.A.
• See 36-Across
• Well-kept secret, for some
• Kind of group
• Tree rings indication
• See 48-Across
• Get on
• Slice of history
• Sensitive subject, to some
• See 115-Down
• Period