Sanitation of hospital eyeing reforms (7)
I believe the answer is:
hygiene
'sanitation' is the definition.
(I've seen this before)
'hospital eyeing reforms' is the wordplay.
'hospital' becomes 'h'.
'reforms' indicates an anagram.
'eyeing' anagrammed gives 'ygiene'.
'h'+'ygiene'='HYGIENE'
'of' is the link.
(Other definitions for hygiene that I've seen before include "Practice of cleanliness to maintain health" , "Clean practice" , "The practice of cleanliness for health reasons" , "Sanitary science" , "Principles and practice of cleanliness" .)