one-horse

adjective3

1. •
   Drawn or worked by a single horse.

   • He constructed a one-horse plough for me about two years ago, which only weighs 581b., for planting potatoes. — 1839
2. •
   Small, insignificant.

   • Let us have no one-horse candidate for the Presidency. General Grant is the man. — 1871
3. •
   Having no competitor.