The wing scorched over for a fine treble to give Clevedon a 28-12 lead at half-time, with centre Cameron Maslen intercepting to touch down for his side's fourth.
Joe Ford added a fifth after the break, before Josh Mortimore scored Clevedon's sixth in the dying minutes. Kieran Hill kicked four conversions out of sixth.
Clevedon made a hugely impressive start to the game and were three tries up in no time, as James twice, Maslen saw the visitors open up a comfortable lead in the first 20 minutes.
But Coney Hill hit back and using their forward power, scored twice in quick succession to close the gap.
Clevedon's backs were enjoying the dry weather and wide open spaces and another neat handling move saw James completes hat-trick before the break, securing a bonus-point in the process.
Early in the second half, young hooker Joe Ford crossed for a superb try as Clevedon opened up a 33-12 lead, but Coney Hill hit back with two more tries of their own thanks to more powerful work up front.
On 70 minutes, after taking a scrum against the head, scrum-half Josh Mortimore darted over for his his Clevedon's sixth try as the visitors regained control.
But it was the home side who had the final say, powering over for two more tries late on to give the scoreline a much closer feel.
Clevedon sign off the season with a home game against Drybrook on Saturday.
Last weekend's win means they will finish in eighth place in South West One West, having briefly flirted with relegation.
Kick-off is 3pm at Coleridge Vale.