One last novel Goethe later unveiled (2,3,10)
I believe the answer is:
in the altogether
'unveiled' is the definition.
Both the answer and definition are adjectives. Perhaps you can see a link between them that I don't see?
'one last novel goethe later' is the wordplay.
'one' becomes 'i' (Roman numeral).
'last' becomes 'nth' (I am not sure about this - if you are sure you should believe this answer much more).
'novel' indicates anagramming the letters (letters in a new or novel order).
'goethe'+'later'='goethelater'
'goethelater' is an anagram of 'ealtogether'.
'i'+'nth'+'ealtogether'='IN THE ALTOGETHER'
Can you help me to learn more?
(Other definitions for in the altogether that I've seen before include "wearing nothing?" , "barely seen" , "unclothed" , "exposed" , "having nothing to wear?" .)