Clotted cream? I don't think of crème fraîche as being clotted cream.
Here are the online Oxford's definitions:
crème fraichePronunciation: /krɛm ˈfrɛʃ/
noun
(mass noun)
a type of thick cream made from double cream with the addition of buttermilk, sour cream, or yogurt.
http://www.oxforddictionaries.com/definition/...clotted cream
noun
(mass noun) chiefly British
thick cream obtained by heating milk slowly and then allowing it to cool while the cream content rises to the top in coagulated lumps:
(as modifier): they serve clotted cream teas
http://www.oxforddictionaries.com/definition/...I wouldn't want crème fraiche on my scones or clotted cream on my Flammkuchen. ;-)
I take your point, though, that you could probably make crème fraiche from clotted cream by adding the sour ingredients.