Senior writer rebuffed rubbish, incomplete concept (6)
I believe the answer is:
editor
'senior writer' is the definition.
'editor' can be an answer for 'writer' (thesaurus). I am unsure of the 'senior' bit.
'rebuffed rubbish incomplete concept' is the wordplay.
'rebuffed' says the letters should be written backwards.
'rubbish' becomes 'rot' (I've seen this before).
'incomplete' means to remove the last letter.
'concept' becomes 'idea' (I've seen this before).
'idea' with its final letter removed is 'ide'.
'rot'+'ide'='rotide'
'rotide' backwards is 'EDITOR'.
Can you help me to learn more?
(Other definitions for editor that I've seen before include "One prepares a work for publication" , "One who revises another's writing" , "Journalist in charge of publication" , "Times boss maybe" , "Senior journalist" .)