Clifford alarms are usually pretty hard to over ride and pulling the fuse typically disables them more. Check for a valet switch or button under the dash that you can push/flip while the key is in the ignition. Unless it is the one with the coded valet switch that has momentary and lock on positions and a pattern programmed in. If the LED is solid, that usually means valet and it should start. Does the starter turn over the engine or just nothing?