He did not progress beyond 31, though, on this occasion, falling four overs before tea after Moriarty and off-spinner Bess bowling in tandem had introduced an element of frustration.
Attempting to hit Moriarty over the leg side, Clarke miscued to mid-on where Matthew Revis, back-pedalling furiously, fell over backwards as he grabbed the ball with his left hand and, despite a heavy landing, it stuck there.
After Jack Haynes, on eight, had escaped a sharp chance to Adam Lyth at slip off Moriarty, Slater clipped Bess to the leg-side boundary for his 12th four to move into the 90s.
Yet, with a first century of the season seemingly there for the taking, he missed out, tempted by an opportunity to get there in one hit as Moriarty strayed wide but hitting straight to Hill at cover.
Ishan, primarily known for his exploits in T20 cricket, announced himself with a flurry of boundaries, including three in the same over off Hill.
But Yorkshire’s current leading wicket-taker responded by dismissing Haynes leg before for his 33rd success of the season before the second new ball was taken with Nottinghamshire 253-5, adding another – and another unforced error from the home side’s perspective – as Lyndon James was caught at extra cover.
Ishan was still there on 44 when bad light brought play to an end, two overs early.