Toss the strawberries with the sugar, lemon juice, and Clearjel. Set aside.
Make the crumble topping by cutting the butter into the flour and sugars. Use your fingertips or two forks to blend it all together until it becomes coarse crumbles.
If you like, carefully remove the frozen pie crust from its tin and put it into your own pie dish. Set the dish on a baking sheet to catch any dripping juices.
Transfer the berries to the pie crust, but leave any extra juices behind. Mound them in the center of the pie and top with the crumble mixture.
Bake at 400F for 15 minutes, then turn the heat down to 375F for another 40 minutes, or until the top is browned and the juices are bubbling.