Clark competed in badminton at the 1992 Summer Olympics in women's doubles with Julie Bradbury.

In the quarterfinals they were beaten by the eventual gold medalists, Hwang Hye-young and Chung So-young of Korea, 5–15, 5–15.

1 and a six-time Commonwealth Games gold medal winner has experienced making the transition to a leading badminton commentator challenging in the beginning.

Gillian overcame the challenges, gradually becoming a worldwide beloved figure in the commentary booth called "oma Gill" by many.

Her signature catchphrase, “I don’t believe it,” has become synonymous with extraordinary moments on the badminton court.