Question about clone

Any idea why this Clone is taking so long to take off? It's been in the veg tent probably 2 weeks or more and just isn't shooting although its grown lots of roots and the stalk is fattening up but just isn't growing leaves. Any idea why it takes so long? VPD is spot on undet LED and All other seedlings doing fine

Just guessing that the roots are still trying to fill up the container and the above-ground part won’t grow until they do. That’s based on what I have heard or read — I don’t think it has ever happened to me. If you have any SuperThrive, you might give it a dose to see if it jump-starts the green growth. Alfalfa tea might work also.