1: Hellish painter spoke piffle (5)
4: Frost to cover the cake (3)
6: Navigate by terse directions (5)
7: God! Get real! There's no point getting upset (3)
8: Poor man's right to make powerless (9)
10: Backblock not all there (3)
12: Scotsman to notice fundamental singular metaphysical entity (5)
13: Bend in the middle and wind back (3)