Experiment in hearing (5)
I believe the answer is:
trial
This clue is a double definition.
'experiment' is the first definition.
(I know that trial is a type of experiment)
'hearing' is the second definition.
(as in a court case)
'in' is the link.
(Other definitions for trial that I've seen before include "Court proceedings" , "Experiment - adversity" , "French actor who sings" , "Court examination; test" , "Suffering - litigation" .)