Specialised hospital, friendly nurses (5)
I believe the answer is:
niche
'specialised' is the definition.
(I've seen this before)
'hospital friendly nurses' is the wordplay.
'hospital' becomes 'H' (abbreviation for hospital).
'friendly' becomes 'nice' (nice can mean kind or friendly).
'nurses' indicates putting letters inside (nurse can mean to hold onto or harbour).
'h' put into 'nice' is 'NICHE'.
(Other definitions for niche that I've seen before include "Recess - alcove" , "small specialised market" , "Specialist area" , "Speciality" , "Suitable slot" .)