So basically this would be a way for CD Leaders and general CD to figure out if someone should be trusted. For example, if someone team killed too much their reputation lowers and that can help leaders decide if they should be let into their clan. Or it can help general CD know if they should stay away from them. Not sure what would increase reputation so please give feedback!
Too add on to this, maybe as a benefit people with higher reputations can get discounts on guns.