Possible Clues:

• Sharp-wittedness
• 'Shrewdness, astuteness (6)'
• Account you bring to lads provides ability to make good judgments
• Sagacity
• It's not in mint sauce - that much is common sense
• The last word about copper's keen insight
• Intelligence team headed by a copper
• Keenness of judgment
• Skill
• The ability to make good decisions