Cika wannan jumla:
Gasar Wasanni ta Para Athletics ta Duniya ta 2019 a Dubai, Clifford ta kafa tarihin duniya na 3:47.78 ta lashe lambar zinare a tseren 1500m na maza T13. Clifford tare da jagororinsa biyu Tim Logan da Philo Saunders sun lashe tseren maza na mita 5000 T13. Clifford ya bayyana cewa yana bukatar jagora don mita 5000 saboda rashin gani da yake yi wanda ya sa lamarin ya zama mai hadari a gare shi.