[jambo]

You may need the clutch in to start either way, so it could be the clutch, or side-stand switch.

A safety cut-out switch on your bike is playing up, you have 2 options:

1) Replace the cut-out switch on the side stand/clutch itself with a working item.
2) Cut the wires and connect them together, bypassing the cut out switch.
Note: This means nothing will stop you from riding off with the stand down accidently. It seems unlikely, but that's what the switch is for, it would be nasty if you did manage it, and it's important you make this decision knowing this.

If you look by the side stand there is a push switch facing to the rear, which is pushed in by a tab on the side stand. This is the switch you need to test, then repair, replace, or bypass.

Jambo