Complaint from a bishop during awkward chat (7)
I believe the answer is:
Here is my best explanation:
'complaint' is the definition.
'a bishop during awkward chat' is the subsidiary indication.
'bishop' becomes 'rr'.
'during' indicates putting letters inside.
'awkward' indicates anagramming the letters.
'chat' with letters rearranged gives 'cath'.
'arr' placed into 'cath' is 'catarrh'.
'from' is the link.
(Other definitions for catarrh that I've seen before include "Nasal discharge of mucus", "Cold in the head", "Problem with cold", "Arch rat with inflamed mucous membrane", "(Inflammation causing) excessive mucus", "Nasal problem", "Arch rat with inflammation of mucous membrane", "Nasal congestion", "Inflammation of membrane of nose and throat" and "Nasal build-up".)