Luggage trial (4)
I believe the answer is:
case
I believe this clue is a double definition.
'luggage' is the first definition.
(eg a suitcase)
'trial' is the second definition.
(as in a legal case)
(Other definitions for case that I've seen before include "Legal action; box of wine" , "Action taken" , "See 12" , "that paperback lacks?" , "Box or outer covering" .)