Boxed (5)
I believe the answer is:
cased
'boxed' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cased that I've seen before include "Reconnoitred (sl.)" , "examined with intention to rob" , "put in a box" , "Carefully inspected (for crime)" , "Covered, protected; checked over (by robber)" .)