car won't start. check battery, terminals, starter, clutch pedal sensor. ????

yes

Do you have a voltmeter to test with? .... START by PROVING battery voltage sufficient - test battery (12.5?) ..NEXT , with helper turn key and check for voltage at solenoid-Results?-- IF full battery voltage , test main wire at starter (thick , primary from battery) should also have same -full battery voltage. IF both those test good , then your starter has failed. Next IF NO signal voltage to solenoid , check ALL fuses . Then test at clutch switch , test switch for continuity when PEDAL IS DEPRESSED or if switch is removed for testing , test it with and without pushing button in (normally OPEN circuit when pedal pushes switch IN , so should have continuity when removed from bracket and not pressed) with key in 'CRANK' position should have battery voltage at 1 of the wires at connector to clutch switch. Reply with those results if needed.