It is very clear - you must be in sight of ground at all times. However, anyone who has spun or looped an aircraft on a clear day with a PPL will have technically broken that rule.
As long as you can see ground - you are legal - doesn't matter how far ahead it is, whatever. No wx forecast will be used to 'prove' you didn't have sight of ground... can't be done.
You say the questions are for the greater good, yet I sense (using the force !) you wish to test your boundaries. Average lifespan for a non-instrument rated pilot in IMC is not long. Minutes, if that.
'Clear of cloud and in sight of ground' mean just that. Clear. In sight. Messing about with cumulus in your permit aircraft will have you scattered across the sky fairly rapidly whether you have the ground in sight or not !
Be safe. Know your limits. Clear means 'a long fekking way from', 'in sight' means 'a lot of ground'. Interpret how you wish
