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It depends on what you regard as massive clearances, really. It'll take 38mm tyres, and can run 35mm with mudguards with a decent amount of room. The clearances on forks seem to be more of a variable, ranging from 35mm to 40mm. I'm not getting into monster cross with this one!
I've made the TT more dropped than the traditional squarer CX bike style to expose a decent amount of seat post, the thinking being to allow it to do more work over rougher surfaces. Obviously the tyre pressures are going make a major contribution there.
Basically road geometry with slightly longer chainstay and massive clearance for whatever new big lightweight tyres cropping up in the future?