Poem that begins "Once upon a midnight dreary," with "The" (5)
I believe the answer is:
raven
'poem that begins once upon a midnight dreary with the' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for raven that I've seen before include "Crow-like bird" , "Bird in 1's poem" , "pig" , "flesh-eating bird" , "Flighty type" .)