Another untimely bogey for Clarke opened the door for Brown to force a playoff hole, which he duly did.
The pair headed down the 10th for a sudden death playoff where New Zealand representative Brown took the spoils, the second year in a row where he has won in a playoff.
Other credible finishes were Alex Neely (fourth place at two over), Christian Nitsche (seventh place at five over) and Kadin Neho (11th place at 11 over).
In the women's field, Northland stalwart Kylie Jacoby looked to impose her dominance around her home links but found some tough competition in North Harbour rep Subin Wui.
The pair were all tied up heading into the final round where they both carded rounds of 77 to finish with a total of 228, 12 over par for the weekend.
Another sudden death playoff down the 10th hole and then back up the 18th was required to find a winner. Wui got the better of the Waipu local to claim the 2017 title.
Mangawhai's Belinda May recorded a credible finish in third place while Wellsford's Alayna Cox and Hikurangi's Jenny Peters were not far back in the field.
Northland representatives now look forward to taking on North Harbour at Mangawhai Golf Club in the Great Northern Battle tomorrow.