has–been 
/ˈhæzˌbɪn/ noun
plural has–beens /ˈhæzˌbɪn/ noun [count] informal : a person who is no longer popular or successful
▪ They called him a washed-up old has-been. ▪ a famous child actor who had become a has-been at 25 — often used before another noun ▪ a has-been singer
▪ They called him a washed-up old has-been. ▪ a famous child actor who had become a has-been at 25 — often used before another noun ▪ a has-been singer
