Definition of "subgenre"

You have to give director Colm McCarthy, a Scottish TV veteran making his feature film debut, and writer Mike Carey, adapting his own novel, credit for attempting the seemingly impossible task of doing something new with the zombie subgenre.

2017 February 23, Katie Rife, “The Girl With All The Gifts tries to put a fresh spin on overripe zombie clichés”, in The Onion AV Club‎