______virus (6)
(Other definitions for corona that I've seen before include "Glow around the sun" , "Ring round the sun, or a big cigar" , "Sun's gaseous envelope" , "Aureole" , "Ring around the sun" .)
(Other definitions for dna that I've seen before include "Bodily substance that stores genetic information - police use it to identify" , "Genetic material often used by police" , "Substance that stores genetic information - often used by police" , "Initially, it stores genetic information" , "Substance that stores genetic information in body" .)