17 across (6) Before start of year, reproduced green power E?e?p? [cryptic clue]
30 across (7) Engineered the last form of military technology m?e???h
45 across (8) severe mental illness, in law R?s?n?t?
56 across (3,4)Therapeutic device that emits ultraviolet light s?? ?a?? (Is it sun something or other?)
31 down (5) Primate and mule breaking down resistance ??m?r [cryptic clue] Is it Ohm?r