It symbolises everything horrific about ecstasy (8)

I believe the answer is:

allegory

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'it symbolises' is the definition.
The definition suggests a singular noun which matches the answer.

'everything horrific about ecstasy' is the wordplay.
'everything' becomes 'all' (all things).
'horrific' becomes 'gory' (I've seen this before).
'about' says to put letters next to each other.
'ecstasy' becomes 'E' (informal term for the drug).
'gory' put after 'e' is 'egory'.
'all'+'egory'='ALLEGORY'

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(Other definitions for allegory that I've seen before include "Symbolic tale - early log (anag)" , "Visible symbol of an abstract idea" , "Symbol representing an abstract idea" , "Metaphor; parable" , "sort of story" .)

I've seen this clue in The Times.

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