Sanitariness (7)
I believe the answer is:
hygiene
'sanitariness' is the definition.
(I know that hygiene is a type of sanitariness)
This is the entire clue.
(Other definitions for hygiene that I've seen before include "Personal cleanliness" , "The practice or conditions of cleanliness" , "Sanitary practices conducive to health" , "Cleanliness, sanitation" , "Practice of cleanliness to maintain health" .)