20d ...this one could be minding (5)
Answer has to be VIRUS and the clue is a “follow on” from 18d
18d For 11 new poison...(5) to which the answer was TOXIN.
Apart from a bit of a link between toxin and virus I just don’t understand the clue to 20d. Anyone work this one out? Will I be kicking myself in a few minutes? ;-)