Dismiss leaders of empanelled jury ending criminal trial (5)
I believe the answer is:
eject
'dismiss' is the definition.
(thesaurus)
'leaders of empanelled jury ending criminal trial' is the wordplay.
'leaders of' says to take the initial letters.
The first letters of 'empanelled jury ending criminal trial' is 'EJECT'.
(Other definitions for eject that I've seen before include "DVD player button" , "Turn out" , "Expel, chuck out" , "Discharge; evacuate" , "Send out forcibly" .)