Sanitary practices (7)
I believe the answer is:
'sanitary practices' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for hygiene that I've seen before include "Condition promoting sanitary practices" , "Practice of cleanliness to maintain health" , "Clean and healthy practices" , "The practice or conditions of cleanliness" , "Clean, healthy habits" .)