Specialised hospital, charming nurses (5)
I believe the answer is:
niche
'specialised' is the definition.
(I've seen this before)
'hospital charming nurses' is the wordplay.
'hospital' becomes 'h' (abbreviation for hospital on maps).
'charming' becomes 'nice' (I've seen this before).
'nurses' is an insertion indicator (nurse can mean to hold onto or harbour).
'h' put within 'nice' is 'NICHE'.
(Other definitions for niche that I've seen before include "Suitable location" , "ideal position" , "Recess - suitable position" , "market area for specialists" , "Position well suited to the occupier" .)