Section in medical facility lacking in comfort? (7)
I believe the answer is:
spartan
'lacking in comfort?' is the definition.
(spartan can mean basic or austere)
'section in medical facility' is the wordplay.
'section' becomes 'part' (synonyms).
'in' is an insertion indicator.
'medical facility' becomes 'san' (short for sanatorium).
'part' put inside 'san' is 'SPARTAN'.
(Other definitions for spartan that I've seen before include "Frugal" , "Austere - disciplined" , "Indifferent to luxury" , "Simple and harsh, without luxuries" , "Basic" .)