To exhibit clayness is to undertake an activity, mainly sporting, with fitness and bloody minded determination rather than outstanding natural ability.
This will be exhibited mainly in aryan and Oriental races.
For true Clayness, no emotion must be exhibited. There is neither the ecstacy of victory or the disapointment of defeat, only the next contest.
To face an opponent with clayness is also very frustrating and can only be overcome with a top draw performance or a moment of shear brilliance.
"I took the ball past him three times and still he got up to kick at my heals"
"Denis Irwin has unbelievable Clayness, that winger skinned him and he still got off his arse to block the cross"