Fine comic story, so good I can’t tell you (9)
I believe the answer is:
ineffable
'good i can't tell you' is the definition.
I can't judge whether this definition defines the answer.
'fine comic story' is the wordplay.
'comic' indicates an anagram.
'story' becomes 'fable' (fable is a kind of story).
'fine' with letters rearranged gives 'inef'.
'inef'+'fable'='INEFFABLE'
'so' acts as a link.
Can you help me to learn more?
(Other definitions for ineffable that I've seen before include "defying expression" , "Inexpressible" , "Too great to be put into words" , "impossible to describe" , "Defying description" .)