Turn away from the defender and finish. Protect the ball with your body, feel the marker, and spin off his blind side before finishing across the keeper.
As the base, but a defender marks the striker's back. Emphasise protecting the ball with an arm and body, feeling which side the defender is on, and rolling him to turn away into space. Start with the defender passive, then make it live. Rotate the roles.
Fork it into your private drills, then change the animation, adjust positions, swap equipment, or drop it into a session block.