Possible Clues:

• Number of wheels on a semi
• Number of holes for a golf course
• Rowing crew, still with no victory figure
• Number of holes he has teeing off?
• Majority? Not a resounding one in the average constituency
• Is he teeing up the number?
• Minimum age required to stand for Parliament
• Figure to get hack's sound support, first to last
• Nearly seven pillar boxes then appeared in London
• Cardinal showing gravity — not weak, even at the end