Nit-picking editor in room off kitchen (8)
I believe the answer is:
pedantry
'nit-picking' is the definition.
(I've seen this before)
'editor in room off kitchen' is the wordplay.
'editor' becomes 'ed' (abbreviation).
'in' is an insertion indicator.
'room off kitchen' becomes 'pantry' (I can't justify this - if you can you should believe this answer much more).
'ed' put inside 'pantry' is 'PEDANTRY'.
Can you help me to learn more?
(Other definitions for pedantry that I've seen before include "Excessive concern with minor rules" , "nit picking" , "Over-attention to detail" , "excessive formality" , "Excessive concern with minor detail" .)