New space, it is sterile (7)
I believe the answer is:
aseptic
'sterile' is the definition.
(synonyms)
'new space it' is the wordplay.
'new' indicates an anagram.
'space'+'it'='spaceit'
'spaceit' anagrammed gives 'ASEPTIC'.
'is' is the link.
(Other definitions for aseptic that I've seen before include "avoiding germs" , "Free from bacteria, surically clean" , "Free from harmful bacteria" , "ideal conditions for hospital?" , "Free from bacteria, surgically clean" .)