Common virus Neal developed (9)
I believe the answer is:
universal
'common' is the definition.
(I've seen this before)
'virus neal developed' is the wordplay.
'developed' indicates anagramming the letters.
'virus'+'neal'='virusneal'
'virusneal' with letters rearranged gives 'UNIVERSAL'.
(Other definitions for universal that I've seen before include "All-inclusive" , "Common" , "Applying everywhere" , "blanket" , "for general viewing" .)