Clap skate. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/clap-skate
(plural clap skates)
(sports, longtrack speedskating) a type of speedskate used in longtrack speedskating, where the skateblade is hinged at the front pillar to the boot, with the heel pillar being free, and kept in place by a spring mechanism.
English Wiktionary. Available under CC-BY-SA license.