Pedal down, in gear, handbrake on, turn on the starter.
Or back end in the air, front chocked securely, start in gear, clutch down stamp on the brakes.
Or bit of wood to hold the pedal down and leave it till you hear a clang in the middle of the night as it frees off.
Of course, if it's not just stuck then the above are probably not the best things to try...
The old Triumph clutches may stick, but the fwd ones (real ones, nothte Honda!) can be accessed by dropping a couple of bolts out a cover - Really quite nice, a bit of gentle prodding can free them off with no hassles at all
