Mistake involving slack traditionalist (8)
I believe the answer is:
blimpish
'traditionalist' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?
'mistake involving slack' is the wordplay.
'mistake' becomes 'bish' (I've seen this in other clues).
'involving' is an insertion indicator.
'slack' becomes 'limp' (I've seen this before).
'bish' going around 'limp' is 'BLIMPISH'.
Can you help me to learn more?
(Other definitions for blimpish that I've seen before include "reactionary" , "(0f a elderly person) with incurably pompous and conservative views" .)