1 down: Power-walking leader rejected current races after start (7)
AL pointed out how this is solved, and it most certainly is nasty. The nastiness comes from current races = regatta, an oblique connection yet a connection nonetheless. And with that piece of information, you get walking leader = w, current races = regatta, current races after start = egatta, rejected current races after start = attage and walking leader rejected current races after start = wattage = power.