Clein came to prominence after winning the BBC Young Musician of the Year competition in 1994 with her performance of the Elgar Cello Concerto.
She was the first British winner of the Eurovision Competition for Young Musicians in Warsaw, playing the Shostakovich Sonata and Elgar's concerto.
She is a keen recital and chamber performer and has curated a series of concerts for BBC Radio 3 at LSO St Luke's.
She regularly works with contemporary composers such as Judith Weir, Thomas Larcher, Brian Elias, Charlotte Bray, Deborah Pritchard, Deidre Gribbin and Dobrinka Tabakova.
She is Professor of cello at the HMT Rostock and appears regularly on international juries such as the Queen Elisabeth Competition in Brussels and the ARD Wettbewerb in Munich.