Possible Clues:

• Soldiers with a bit of a struggle to succeed?
• Artists manage to find a daily routine
• Grind last bit of pepper -- a pinch!
• Tedious working life
• Life's competition
• Tear off to back the car in. It's a busy life
• Runs on a track in relentless struggle
• Artillerymen follow scramble to get on
• Jack comes back, and people struggle to get on
• Run on a track in keen competition