BosGuy brain teaser

This week’s riddle is fairly straightforward, but I found it completely maddening and had to give up. Perhaps you’ll fare better.  Share it with friends or colleagues at work and see if you can figure it out.

I will post the answer in the comment section of this post later this afternoon.  I hope you enjoy this week’s challenge.

If you take the letters ERGRO and put the same three letters in front and following them you will form a common English word.   What are those three letters and what is the word it creates?

_ _ _ ERGRO _ _ _