People who quibble with journalist in underwear (7)
I believe the answer is:
pedants
'people who quibble' is the definition.
'pedants' can be an answer for 'people' (pedant is a kind of person). I'm unsure of the remainder of the definition.
'journalist in underwear' is the wordplay.
'journalist' becomes 'ed' (short for editor).
'in' indicates putting letters inside.
'underwear' becomes 'pants' (underpants).
'ed' placed into 'pants' is 'PEDANTS'.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for pedants that I've seen before include "More than one lover of accuracy" , "Paraders of knowledge" , "They are over-concerned with correctness of detail" .)