C-list
/ˈsiːlɪst/originally US
noun
1The third in a series of lists, especially lists ranked in order of preference or significance.
2Any (notional) list comprising the relatively unimportant members of a particular group, especially in the entertainment industry or the media; a group of minor or formerly prominent celebrities or socialites.
adjective
Of or belonging to a C-list; specifically designating or relating to a (notional) roster of relatively unimportant or formerly prominent individuals, especially in the entertainment industry or the media. Usually attributive.
Origin
Early 20th century; earliest use found in William Henry Beveridge (1879–1963), social reformer and economist. From C + list, after A-list.