For what it's worth, in 1891 and 1901 Clara was going by her middle name of Beatrice - but possibly only because her mother's name was Clara.
RG 12 / 323 / 36 / 10 and RG 13 / 348 / 79 / 6
Birth - Clara Beatrice Samuels, 2nd q. 1883, Islington 1b 330