C for communication? (6)
I believe the answer is:
letter
This could be a double definition.
'c for' is the first definition.
The definition suggests a singular noun which matches the answer.
'communication?' is the second definition.
(letter is a type of communication)
Can you help me to learn more?
(Other definitions for letter that I've seen before include "Eg, A" , "he leases" , "Character - landlord - epistle" , "Form of correspondence" , "Alphabetic character" .)