Story writer not describing sick Elvis (8)
I believe the answer is:
novelist
'story writer' is the definition.
'novelist' can be an answer for 'writer' (novelist is a kind of writer). I am unsure of the 'story' bit.
'not describing sick elvis' is the wordplay.
'describing' is an insertion indicator (describe can mean to form the outline of).
'sick' indicates anagramming the letters.
'elvis' is an anagram of 'velis'.
'not' going around 'velis' is 'NOVELIST'.
Can you help me to learn more?
(Other definitions for novelist that I've seen before include "Source of books" , "King maybe" , "I've written" , "Writer of fiction books" , "Book writer" .)