minor-leaguer

[ mahy-ner-lee-ger ]
/ ˈmaɪ nərˈli gər /

noun

a member of a minor-league team.
Informal. a person whose skill or ability is suited only to a minor league or to a minor role in life.

Origin of minor-leaguer

An Americanism dating back to 1880–85; minor league + -er1