Had that recently with one of my vehicles, intermittent no crank from a clutch switch on it's way out....
The GOOD thing, is that you can dive under the dash on the Focus & get to it easily for testing/emergency repair.
You'll see one or two switches "tripped" by the clutch pedal depending on it's position (two if you have cruise). The one you want is at the back, pressed in by a tab on the arm when the clutch is fully depressed.
Emergency fix is to use a bent paper clip to "jump" the switch (plug into the connector) so it always thinks the pedal is depressed. This will bypass the "Safety" of needing to depress the clutch B4 starting, so make sure it's in neutral/clutch depressed before starting or you may take a surprise ride.....
This'll get you home, and you can replace the switch at your convenience...
Last edited by sailor; 11-18-2012 at 12:52 PM.