In 4E, teleports require line of sight, but do *not* require line of effect. You could teleport through a glass window, no problem.

So, in general, if a power gives you line of sight where otherwise you would not have it, the answer is "yes". Provided the distance teleported from your location does not exceed normal restrictions. The distance teleported is based on your physical location, not your viewpoint. So you cannot combine the powers to travel further than normal. But you could use the combination to teleport through walls and around corners.

I'd like to extend this answer using actual text from "Seer's Clairvoyance", but don't currently have access to the sourcebook. The critical issue is whether that power explicitly gives you line of sight, or at least implies it beyond vague "visions". Even in the latter case I would probably allow it (non-RAW) provided the distance was not exceeded.