Little-known connection? (6)
I believe the answer is:
hyphen
'connection?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for hyphen that I've seen before include "Mark joining two words" , "Horizontal words joiner" , "A horizontal word-joiner" , "Line in a double-barrelled name, say" , "Sign linking words" .)