Beat the defender to the near post. Time the run to arrive across your marker and get the first touch on the low cross before he can clear it.
As the base, but a defender contests the near post. Emphasise the striker timing his run to get across the defender and attack the ball first. Start with the defender passive, then make it live. Both flanks. Rotate the roles.
Fork it into your private drills, then change the animation, adjust positions, swap equipment, or drop it into a session block.