Germ-free space? It may be arranged (7)
I believe the answer is:
aseptic
'germ-free' is the definition.
(I've seen this before)
'space? it may be arranged' is the wordplay.
'may be arranged' indicates anagramming the letters.
'space'+'it'='spaceit'
'spaceit' anagrammed gives 'ASEPTIC'.
(Other definitions for aseptic that I've seen before include "Free of bacterial or viral contamination" , "Sterile" , "avoiding germs" , "Free from bacteria, surgically clean" , "Paciest (anag.)" .)