毎回やりかを忘れ。。
Personal access tokens
-->https://github.com/settings/tokens
$ git clone https://github.com/private-organization/repository.git Cloning into 'repository'... Username for 'https://github.com': xxx Password for 'https://xxx@github.com': {ここでGitHubのパスワードでなくtokenを入力する}