Short story about off-colour post (6)
I believe the answer is:
pillar
'post' is the definition.
(a pillar is a post or column)
'short story about off-colour' is the wordplay.
'short story' becomes 'par' (I can't justify this - if you can you should believe this answer much more).
'about' means one lot of letters goes inside another.
'off-colour' becomes 'ill' (off-colour can mean unwell).
'par' going around 'ill' is 'PILLAR'.
Can you help me to learn more?
(Other definitions for pillar that I've seen before include "person providing reliable support" , "Supporter" , "Supporting column" , "Tall vertical structure, of stone say" , "Stylite would live on it" .)