See YouTube video - Elbow set play to attack a 1-3-1 zone.
A 1-4 high set.
1 dribbles it over, 4 pops out for a pass (creating a two-on-one on that side), 5 dives and buries X1, 2 and 3 go to the corners.
Look for 4 to pass inside to 5 (shown) or to 3 in the corner, or to shoot.
(Can use this as an entry to a 2-1-2 or 4-out 1-in set)
For a similar approach see Don Kelbick - Get layups against a 1-3-1 zone (YouTube).