Adventure story's thematic end televised out of sequence (4,3,3,10)
I think it could be either:
emil and the detectives
'adventure story's' is the definition.
(1929 novel by Erich Kstner)
'thematic end televised out of sequence' is the wordplay.
'out of sequence' is an anagram indicator (letters in a new sequence).
'thematic'+'end'+'televised'='thematicendtelevised'
'thematicendtelevised' anagrammed gives 'EMIL AND THE DETECTIVES'.
If this is the answer I cannot explain how the clue works.
Can you help me to learn more?
(Other definitions for emil that I've seen before include "- - Zatopek, Olympic runner" , "French boy's name" , "German boy" .)