The 24-year-old re-joins the New Cuthbury outfit from Sydenhams Football League (Wessex) Premier neighbours Shaftesbury.
Kellaway signed for The Rockies in August after leaving Wimborne, where he had returned to towards the end of the 2019/20 season.
He originally progressed through the Magpies` youth system and made over 100 appearances and featured in the Dorset Senior Cup final victory back in April 2018, and in both the play-off semi and final just a month later.
He departed for Australia in November 2018 but returned just ahead of the initial lockdown in March 2020.
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