Doctor rations all antibiotics initially in hospitals (9)
I believe the answer is:
sanatoria
'hospitals' is the definition.
(I've seen this before)
'doctor rations all antibiotics initially' is the wordplay.
'doctor' is an anagram indicator.
'initially' indicates taking the first letters.
The initial letters of 'all antibiotics' is 'aa'.
'rations'+'aa'='rationsaa'
'rationsaa' with letters rearranged gives 'SANATORIA'.
'in' acts as a link.
(Other definitions for sanatoria that I've seen before include "Lodgings for patients" , "Hospitals for recuperation" , "Convalescent hospitals" , "Treatment centres" , "nursing homes?" .)