Everyone beginning to enjoy gruesome parable (8)
I believe the answer is:
allegory
'parable' is the definition.
(synonyms)
'everyone beginning to enjoy gruesome' is the wordplay.
'everyone' becomes 'all' (all people).
'beginning to' suggests taking the first letters.
'gruesome' becomes 'gory' (I've seen this in another clue).
The first letter of 'enjoy' is 'e'.
'all'+'e'+'gory'='ALLEGORY'
(Other definitions for allegory that I've seen before include "Metaphor; parable" , "Story with symbolic characters" , "Its characters are personifications" , "literary device" , "tale with hidden meaning" .)