Today is the first I've heard this term. Anyone else familiar with it? How long has it been around? Is it in the OED?

home.xtra.co.nz/hosts/Wingmakers/Clairsentience.html

It's either very late or very obscure, as OneLook gives it only two hits. Here's one, from Wikipedia

Clairsentience is the umbrella term for the psi (or psychic) sense of touch. A clairsentient person is able to perceive energy fields (through physical sensations), including a person's aura and vibrations (such as voice and how words are strung together). This may also explain the ability to "sense" the presence of non-corporeal entities, such as ghosts

I'm familiar with the word. It's a been around at least 5 years or more.

Fal: To an old fart like me, that makes it very late indeed