150 in ICU falling short in hospital (6)
I believe the answer is:
clinic
'hospital' is the definition.
(thesaurus)
'150 in icu falling short' is the wordplay.
'150' becomes 'cl'.
'falling short' means to remove the last letter.
'icu' with its final letter taken off is 'ic'.
'cl'+'in'+'ic'='CLINIC'
'in' is the link.
(Other definitions for clinic that I've seen before include "Healthcare facility" , "Place for medical treatment or political advice" , "Outpatient session" , "Place or session at which treatment or advice is given" , "Medical treatment centre" .)