There was a translation in the chapter Clare got it saying she could regrow it over a period of months. I don't recall if it was ever explicitly stated she was an offense type warrior, though.
I liked Claymore. I really wanted to see a potential arc where the mainland war was discussed in more depth, but I have no complaints with how it was sent off. 'Stay the fuck off our island, we're not your guinea pigs.' The irony of this whole story being how Clare is EXACTLY what the Organization was trying to make, yet they discarded her and also went the completely opposite way with their research.