Fabricated epic account of purging agent (6)
I believe the answer is:
ipecac
'purging agent' is the definition.
The definition suggests a singular noun which matches the answer.
'fabricated epic account' is the wordplay.
'fabricated' indicates an anagram.
'account' becomes 'ac' (abbreviation).
'epic' with letters rearranged gives 'ipec'.
'ipec'+'ac'='IPECAC'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for ipecac that I've seen before include "That could make you sick!" , "that could make you puke" , "Purgative" , "Drug" .)