She was watching an episode of the BBC soap opera Doctors and noticed Karen Hollins (Jan Pearson) mentioning an off-screen teenage daughter.

She wrote to the BBC to ask if her daughter would appear and if they were casting for her, and after two letters and three emails, Clemmow was called for an audition for the role of Imogen.

Whilst attending the audition, Clemmow had bleached white blonde hair, which she felt made her stand out against other auditionees.

[2][4][5] In 2013, she portrayed the role of Anne Simpson in the television adaptation of The Tractate Middoth, a period drama and ghost story for BBC Two.

[9] Also in 2021, Clemmow portrayed the role of Clementine Churchill in the period drama podcast What Did You Do in the War, Mama?.