Such punctuation goes quickly! (6)

I believe the answer is:

dashes

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'such punctuation goes quickly' is the definition.
I can't judge whether this defines the answer.

'punctuation goes quickly' is the wordplay.
'punctuation' becomes 'dash' (dash is a kind of punctuation).
'goes quickly' becomes 'es' (I can't explain this - if you can you should believe this answer much more).
'dash'+'es'='DASHES'

Can you help me to learn more?

(Other definitions for dashes that I've seen before include "Sprints, runs fast" , "Darts" , "flies!" , "hares" , "Long signals in Morse code" .)

I've seen this clue in the Sydney Morning Herald.

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