Create and finish from a wide overlap. Fix the defender, time the overlapping run, release down the line, deliver a quality cross to the far post, and arrive late to finish. Vary the cross between driven, cutback and floated as a progression.
On the right side with a full goal and keeper, the winger has the ball with a pole just ahead as his marker. The fullback overlaps on the outside around the pole; the winger holds to fix the defender, then releases down the line. The fullback drives to the byline and delivers a driven cross to the far post for the striker, who times his run to finish. Rotate sides and mix the type of cross.
A pole does not recover, does not read the overlap, and does not close the crossing angle. Being clear about that is what makes this drill useful rather than misleading, because every one of those absences is a decision the exercise has quietly removed.
What remains is the mechanical part, and it is worth grooving. The winger's hold is the first piece: carrying towards the defender and keeping the ball a beat longer than feels comfortable, because releasing early sends the full-back overlapping past a defender who never had to commit to anything. Against a pole this has to be coached deliberately, since the pole gives no feedback at all for releasing too soon.
The release should go into the space ahead of the runner, down the line, rather than to his feet. A pass to the feet stops a full-back who was travelling at speed, which throws away the only advantage the move actually generated.
Then the delivery, and this is where the unopposed format genuinely earns its place. A full-back crossing on the run from a wide position is a specific technique, and most players get very few repetitions of it in a match. Twenty in ten minutes, with the coach able to stop and correct, is worth more here than in a live game where the same player might cross three times all afternoon.
Progress it as soon as the technique holds. Swap the pole for a passive defender allowed to jockey, and the decision the pole could never ask for comes back into the exercise.
Save it to your private drills, then change the animation, adjust positions, swap equipment, or drop it into a session block. Or start from a blank pitch and build your own.