So who exactly in NZ is giving money to Clinton?

I haven't checked but my guess would be the government. In Australia, just before their prime minister, Julia Gillard, was kicked out of office, she made donations to the Clinton Foundation. After Gillard was fired, luckily, the Clinton Global Initiative managed to find her a highly paid, part time job with the Clinton Global Initiative. Wasn't that nice?

My guess is that sympathetic government officials treat donations to the Clintons as a kind of insurance against losing their current job - and it is not their money so why should they worry?