Escorts addicts outside hospital (6)
I believe the answer is:
ushers
'escorts' is the definition.
(I know this)
'addicts outside hospital' is the wordplay.
'addicts' becomes 'users' (I've seen this before).
'outside' is an insertion indicator (some letters go outside others).
'hospital' becomes 'H' (abbreviation for hospital on maps).
'users' going around 'h' is 'USHERS'.
(Other definitions for ushers that I've seen before include "Escorts" , "Court officials" , "Theatre attendants" , "Rushes with conductors" , "Wedding helpers" .)