One Word Throwoff

i like doing the crossword from the newspaper. This particular one was frustrating. I put AURA instead of HALO (top left across) and was stumped. The whole puzzle was practically blank. Once I realized the error of my ways, and switched it to HALO, the while puzzle fell into place and was done in about five minutes.

One word threw off the whole puzzle, quite unique.

have a happy Tuesday!