Germ-free (7)
'germ-free' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aseptic that I've seen before include "Sterile" , "ideal conditions for hospital?" , "Free of bacterial or viral contamination" , "Free from bacteria, surically clean" , "Germ-free" .)
(Other definitions for antiseptic that I've seen before include "Preventing growth of, eg, bacteria" , "germicide" , "Clinical" , "treatment" , "Designed to counteract infection" .)