Possible Clues:

• A gift of the Magi
• At start of 15 across, Limerick city director gets first prize
• Word before "standard" or "star"
• Person opposed to 27 shot after part of target
• *Valuable ingot
• Grand antique, 15's end product
• Highest standard, good and ancient
• Wealth perhaps, good and ancient
• Metal whose symbol is Au, and what can be mined in 62-Across
• Andrew --, American singer-songwriter, son of Ernest -- and Marni Nixon