Incident in which Poe dies horribly (7)
I believe the answer is:
episode
'incident' is the definition.
(I've seen this in another clue)
'poe dies horribly' is the wordplay.
'horribly' is an anagram indicator.
'poe'+'dies'='poedies'
'poedies' with letters rearranged gives 'EPISODE'.
'in which' is the link.
(Other definitions for episode that I've seen before include "Distinctive incident" , "Incident in a story or part of a serial" , "Part of TV series" , "Instalment; incident" , "Programme of a serial" .)