Pause mark (5)
I believe the answer is:
comma
'pause mark' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for comma that I've seen before include "Mark for smallest division of a sentence" , "its use may be divisive" , "part of list, invariably" , "breathtaking marking?" , "identifying place to breathe" .)