"That's your qualified tradespeople -- all your vocational qualifications are those levels," she said.
Clark imagined any independent courses to do with business would be targetted first because these were "non-qualifications" with no employment outcomes.
"I don't blame them for that," she said. "But I believe they're targeting everything in that level 3, 4 area so that's your hospitality, your tourism, your healthcare assistants, your automotive qualifications."
The sector was of great benefit to the New Zealand economy and offered a great deal of further potential, particularly to regional New Zealand.
"It's really sad because New Zealand's the best in the world at vocational education and .... about 70 per cent of students come, learn, use their one-year work right and then go home again. And that's what we want."
Labour campaigned to limit the number of student visas for "low-value" courses by 6000 -10,000; remove post-study work visas without a job offer for lower level graduates, resulting in a fall of 9000 - 12,000 students; and to "regionalise the occupation list" to ensure that employers hired New Zealanders first, causing a fall of 5000 - 8000.