Let’s go funk:

 

1. TickyClav by BigTick

http://www.bigtickaudio.com/goodies/tickyclav

The most popular VST for free Clavinet emulation : it’s nice and does what we want.
here’s a demo from uproar24 on youtube :

 

 

2. Topaz Clav 1 by Topaz Audio

http://www.topazproductions.co.uk/subpages/vsts.html

A Synthedit VSt plugin : it’s based on sample (surely a soundfont), so it’s more limited, but the clav sound is good. The filter is pretty basic but together with the samples it does a good job.

 

 

3. Bonus Trax

According this post @ KVR, the Free VSTi String Theory by UGO is more than capable of doing funky Clavinet sounds : and that’s true !!Check the 64 “Segovia” preset in the factory sounds

http://www.ugoaudio.com/index.php/vst-plugins

 

There are also free clavinet soundfonts all around the interweb.
A free sf2 player like SFZ+ and some Clavinet D6 soundfont and here you go.