Pea. For fuck's sake, I was looking at the clue to start with, then changed to looking at countries' names after the guessing started... I can't believe I overlooked that!!!
Aaah, I see. I was going to say that saying "half" in the clue was very misleading but now I see the reason. It was kind of a red herring but wasn't. I can tell you, I can tell you how long. What am I?