Vexatious hearing (6)
I believe the answer is:
trying
I believe this is a double definition.
'vexatious' is the first definition.
(I've seen this before)
'hearing' is the second definition.
('try' can be a synonym of 'hear')
(Other definitions for trying that I've seen before include "Annoying; sampling" , "Hearing (a case)" , "What could be witnessed in court" , "Sitting in judgement" , "Stressful" .)