Possible Clues:

• Persistence of number taking a large town
• Eat tiny bit of chocolate -- breaking resolution!
• Perseverance in chosen course
• Each town gets 'x' for holding on
• Ten of this over a town won't let go
• Bulldog quality
• By sticking to it, X gets to a town
• Perseverance of number joining a big community
• How X will not let slip a town
• Ability to stick firmly to task or position