Clarke, who put his efforts into the sevens following Super Rugby Aotearoa this year, has been named as a travelling reserve.
The Chiefs player Etene Nanai-Seturo, who was in the same situation, has made the 12.
The men's and women's teams are both full of experience with the women's side including seven players who claimed silver in Rio five years ago.
Co-captain Tim Mikkelson, the most capped sevens player in the game's history, is joined by Scott Curry and Sam Dickson who have more than 50 World Series tournament appearances each.