24a / 19a / 23a / 10a / 1d. leonardo's work - is highest - matches hitchens extravaganza (2 on 16 15 ). - H - / - - / - - D - R / T - - - / - - E / - - - - S / A - O - G / - H - C -/ S - - / - - - S....
I can't work out the long clue - have tried all day. 24, 19, 23, 10, 1d Leonardo's work - his highest - matches Hitchens's extravaganza (2, on 16, 15 which is 'Pater' on 'Mona Lisa' I think)...