You could carefully and loosely tie string around the tallest part of the plant, then tie the other side of the string to something lower in the tent to "anchor" the plant away from the light. If it feels like it might snap I wouldn't risk it though. I was thinking maybe you could lean the pot so the plant is slanted and wedge it between objects- but then again watering it would be a pain.
It might just clear it though, there might be enough room considering it's an auto.