7 across. Clue: Name by which the Italian master painter, medallist and frescoist who created Madonna of the Quail, Saint George and the Princess and The Vision of Saint Eustace is known. (9). I have: P?S?N?L?? All the research points to PISANELLO but the last letter in my grid is an N from first letter of NYLON (11 down. Clue: Acrylic fibre developed by Dupont (5). I have: ??L?N. Help please.