There's not really a use for Clarkson here, so I don't think it would need to be much incentive back. There are only two ways I can see this going. 1) We dump him for straight expiring salary. For example, Clarkson for PJ Tucker. 2) We trade him for other undesirable salary, but get a little incentive on top of that. For example, Clarkson for Vincent/Vando/Cole Anthony + a some sweetner.
There is of course, the possibility that nothing happens as has been the case for years now on the Clarkson front.