Line needed for bishop in improved communication (6)
I believe the answer is:
letter
This clue might be a double definition.
'line' is the first definition.
(thesaurus)
'bishop in improved communication' is the second definition.
'letter' can be an answer for 'communication' (letter is a kind of communication). I am not sure about the 'bishop in improved' bit.
'needed for' is the link.
Can you help me to learn more?
(Other definitions for letter that I've seen before include "Written character - landlord" , "Written note" , "Alphabetic symbol" , "Character; missive" , "Character of the alphabet" .)