A professional from age 16 onward, British actress Mary Clare seemed most at home in costume roles. She played Lady Caroline Lamb in The Life of Lord Byron (1922), Queen Eleanor in Becket (1923), Mrs. Corney in Oliver Twist (1948), Mme. Loubet in Moulin Rouge (1952) and Mrs. Peachum in The Beggar's Opera (1953). Clare's "contemporary" film assignments included the sinister baroness in Hitchcock's The Lady Vanishes (1938). In 1942, Mary Clare enjoyed a rare top-billed role in the enjoyable detective comedy-drama Mrs. Pym of Scotland Yard.