Clara was friends with Joey the Clown; the pair took part in contests together. They were used by the Toymaker in a game of blind man's buff against Steven Taylor and Dodo Chaplet. When they failed, they returned to doll form. They were destroyed when the Toymaker's domain was destroyed. (TV: The Celestial Toymaker)
Behind the scenes
Bearing in mind that Cyril, the Knave of Hearts and the Kitchen Boy were all the same person, this may have been the case with Clara the Clown, the Queen of Hearts and Mrs Wiggs. However, this was never confirmed on-screen.