Fission-related (7)
I believe the answer is:
nuclear
(Other definitions for nuclear that I've seen before include "sort of family" , "and 6 Down: Power producer" , "An ulcer (anag)" , "basic family" , "Type of reaction" .)
I believe the answer is:
nuclear
(Other definitions for nuclear that I've seen before include "sort of family" , "and 6 Down: Power producer" , "An ulcer (anag)" , "basic family" , "Type of reaction" .)