Crossword Genius

Cool about new punctuation (5)

Ross

I believe the answer is:

colon

'punctuation' is the definition.
(I know that colon is a type of punctuation)

'cool about new' is the wordplay.
'about' is an anagram indicator.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'cool' anagrammed gives 'colo'.
'colo'+'n'='COLON'

(Other definitions for colon that I've seen before include "Part of body; some punctuation" , "Stop (less than full)" , "Panama port; part of intestine" , "unit of foreign currency" , "Large intestine; punctuation mark" .)

I've seen this clue in The Mirror and The Daily Express.
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