They say 'clear' because it is clear of pattern or colorations. I remember when Sunset went into shed for the first time I was so excited to see him. Where normal balls go into 'blue', ghosts 'blue' is actually white. Just like casper the friendly ghost, where en as I think they originally got there name 'Ghost' from. If your ball turns white when he's in shed, then most likely he is some sort of ghost. I hear green ghosts look fairly normal and shed clear. I've never seen a good photograph of one though, so I can't tell you from personal experience.
Good luck with your boy though.
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Violette Garcia
www.shakahnsgrove.com