The midfielder joins the Seasiders until the end of the season.
The 19-year-old who has previously played for Livingston and spent the first half of the season on loan with Scottish League Two side Stirling Albion, for whom he made 19 appearances, and has also spent time on with Kelty Hearts, Arbroath and Chester-le-Street United.
Clark is eligible for immediate inclusion in the squad ahead of tonight's’s game at Lancaster City.
Welcome to Marske United, Harrison!.