Crossword Genius

It gives one pause, particularly in this clue (5)

Ross

I believe the answer is:

comma

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'it gives one pause' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for comma that I've seen before include "Punctuation mark indicating slight pause" , "repeatedly found in lists" , "part of list, invariably" , "Puncuation mark" , "Punctuation mark - butterfly" .)

I've seen this clue in The Times.
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