A teetotaller, I see, has a high position (5)
I believe the answer is:
'a high position' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
I also know that 'high' relates to this answer.
'a teetotaller i see' is the wordplay.
'teetotaller' becomes 'tt' (abbreviation).
'see' becomes 'C' (the word for the letter, according to Chambers).
'a'+'tt'+'i'+'c'='ATTIC'
'has' acts as a link.
Can you help me to learn more?
(Other definitions for attic that I've seen before include "Upper chamber" , "Floor" , "Room inside a building's roof space" , "Lofty room" , "Room at the top of a house" .)