Clein has collaborated with author Jeanette Winterson on a performance piece which utilises Bach's Goldberg Variations in conjunction with Winterson's text. She has also worked with choreographer and dancer Carlos Acosta.
Clein released an all-Kodály recording in 2009 on Hyperion Records. Previously, she recorded for EMI Classics where her debut recording, a recital disc of Brahms and Schubert cello sonatas with Charles Owen was released in October 2004 on the EMI 'Classics for Pleasure' imprint and her recording of the Chopin and Rachmaninov Cello Sonatas with Charles Owen was released on 25 September 2006. Her EMI recording of the Elgar Cello Concerto, in honour of the 150th anniversary of Elgar's birth, was released in September 2007.