Clark was drafted in by Scunthorpe boss Brian Laws at the start of the season as cover for injured pair Etienne Esajas and Andy Welsh.
But the 19-year-old made just one appearance for Laws' side during his stay at Glanford Park, in the home win over Mansfield in August when he came on as an 88th-minute substitute for Welsh.
Clark, a product of the Oakwell academy, has made a total of six appearances for Barnsley since making his debut against QPR in April 2011.
- Sports & Recreation
- Etienne Esajas
- Brian Laws