Earl hears about dramatic trial (9)
I believe the answer is:
rehearsal
'dramatic trial' is the definition.
'rehearsal' can be an answer for 'trial' (I've seen this in another clue). I'm not certain of the 'dramatic' bit.
'earl hears about' is the wordplay.
'about' is an anagram indicator.
'earl'+'hears'='earlhears'
'earlhears' with letters rearranged gives 'REHEARSAL'.
Can you help me to learn more?
(Other definitions for rehearsal that I've seen before include "Practice session in preparation for public performance" , "Dry run" , "Play run-through" , "Practice - run-through" , "show trial" .)