As seekeerz takes an axe to her motherboard, here are today's shaded clues:
6d Traditional gemstone gift for a 40th anniversary (4)
10d Name of Arya Stark's first sword in the A Song of Ice and Fire series, including A Game of Thrones (6)
52d Plant fibre used to make boaters (5)
54d Common name for the mineral sodium chloride (4)