Advice on white clover

Okay, so I now have a thick crop of white clover on my hugel beds and other rows. I am pulling it up where I can and chopping it off where I can't. I'm spreading it around as good, green, high-nitrogen mulch. I cannot dig it in on hugel beds. My questions:
1. In this area is it a perennial or annual? Will it regrow in the spring?
2. should I be pulling it up by the roots?
3. Should I just leave it alone and let it die in place as a mulch?
4. Did I make a mistake in planting it thickly in the first place?

Any informed advice would be greatly appreciated.

1- perennial
2- as best as you can. dont try to get it all. pull 90+% of it, and the little bit remaining will regrow and respread nicely next year. this is its best quality in the garden, IME
3- no, it will carpet the surface. pull what you can and leave as a surface mulch.
4- no, white clover is nice in the garden. it is easy to manage, provides lots of mulch when pulled up, isnt too aggressive, and acts as a bit of a nurse plant in moderation.

your situtation sounds good. keep up the good work.

In many regions, white clover is also the honey bee's first forage crop of the spring.

I am in New England, so our conditions are a bit different, but I have had success using white clover as a living mulch in a perennial herb garden. I pull it out when it crowds or gets in the way but it rarely gives me trouble. You can trim the tops down for mulch as you plant new plants on the hugel.