The Fringe's backstage pass is for member of barbershop quartet (4)
I believe the answer is:
bass
'quartet' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for bass that I've seen before include "Fish - low in pitch" , "A fish, or the lowest pitch in music" , "Lowest male singer" , "Fish - low voice" , "Fish; deep voice" .)
