A team

noun3

1. •
   The best of a set of teams in a single club.

   • The A team are playing away this Saturday.
2. •
   (informal) A group or team which performs its work most effectively; a very good team.

   • It looks like the A team are on duty tonight - I've never seen the hall cleared so quickly!
3. •
   A country's reserve team or development squad, comprising the best players not selected in the national team.

   • He was then selected for the South African A team before making his international debut.
   • NSW all-rounder Moises Henriques has been named captain of the Australia A team to play England in Hobart next week.