A-list

Short definition from Wiktionary

Noun

1. 1
   The first of a number of lists, especially lists arranged in order of importance or preference.
2. 2
   An informal list of people (especially in the entertainment industry, or professionally or socially prominent) who are the most admired or desirable, or likely to bring success.
3. 3
   Alternative spelling of A-list.

Adjective

1. 1
   Of or relating, or belonging, to an A-list (noun sense 2).
2. 2
   Best of a group; first-class, pre-eminent, top.