Two-dot punctuation (5)
I believe the answer is:
colon
'two-dot punctuation' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for colon that I've seen before include "Part of intestines" , "Part of the intestine - punctuation mark" , "City at the Caribbean entrance to the Panama Canal" , "Punctuate part of the large intestine" , "that may cut sentence" .)