Unspeakable mockery of fine, moral tale (9)
I believe the answer is:
ineffable
'unspeakable' is the definition.
(I know that unspeakable can be written as ineffable)
'mockery of fine moral tale' is the wordplay.
I cannot quite see how this works, but
an anagram of 'fine' is 'inef' which is present in the answer.
'tale' could be 'fable' (I have seen 'Moral tale' mean 'fable' so perhaps 'tale' could also mean 'fable') and 'fable' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for ineffable that I've seen before include "Too sacred to be spoken" , "beyond description" , "Inexpressible" , "Too sacred to be uttered" , "impossible to describe" .)