Patient having died put in a box (5)
I believe the answer is:
'put in a box' is the definition.
(I've seen this before)
'patient having died' is the wordplay.
'patient' becomes 'case' (synonyms).
'having' is a charade indicator (letters next to each other).
'died' becomes 'd' (abbreviation next to the year of someone's death).
(Other definitions for cased that I've seen before include "Reconnoitred (sl.)" , "examined with intention to rob" , "Covered, protected; checked over (by robber)" , "put in a box" , "Carefully inspected (for crime)" .)