starring work; movie starring ...
Refers to a film, drama, or other production in which a particular actor or actress has the leading role. Often used in contexts like '主演作品一覧' (list of starring works) or '彼の主演作品' (his starring film).
Her latest starring film will be released next month.
I've seen all of this actor's starring works.
主演 is the act of starring or the leading role itself, while 主演作品 is the work (movie, drama) in which someone stars.
作品 is a general term for a work of art, literature, or film; 主演作品 specifies that it is a work featuring a particular star.
Compound of 主演 (starring, leading role) and 作品 (work, production). The exact historical derivation is uncertain, but the combination is transparent in modern Japanese.