Related Clues:

• Insight to have last word about copper
• Business nous
• Sharpness; penetration
• Last word about copper’s insight
• Mental sharpness of American going to university in LA, for one
• Sharpness of thought
• Astuteness of a copper with labourers
• Arresting copper is the last word in shrewdness
• I'm not sure poking champion knight shows brains
• Judgement of people supporting a copper
• Mean criminal admitting copper's shrewdness