Just don't die. You may be a bad shooter (I am). Still, just don't die. Every time you die, you give points to the opposing team. So, it doesn't matter if you killed an enemy, or just saved your life. BTW, The Ram helps a lot. PS Is the scoring table for the Clash mode reasonable? That guy with the most points didn't help much our team, it seems, with him dying so much.
Actually this is part of the problem I have with clash...it rewards you more for hiding in a corner than for actually participating. By not dying you deny the enemy points, when given how often enemies prefer to camp and set up kill-zones it quickly becomes the optimal course of action....but it's not fun.