Stubby, colourful writer of a corny novel (6)
I believe the answer is:
crayon
'stubby colourful writer' is the definition.
'crayon' can be an answer for 'writer' (I've seen this before). I am not sure about the 'stubby colourful' bit.
'a corny novel' is the wordplay.
'novel' is an anagram indicator.
'a'+'corny'='acorny'
'acorny' anagrammed gives 'CRAYON'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for crayon that I've seen before include "Writer" , "One colours with this" , "Coloured rod" , "Colouring pencil" , "Waxy pencil" .)