Courier Dally? (9)

I believe the answer is:

messenger

I'm a little stuck... Click here to teach me more about this clue!

'courier' is the definition.
(I know that courier can be written as messenger)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for messenger that I've seen before include "One doing errands" , "Emissary, courier" , "Bearer of communication" , "Courier - don't shoot him" , "Bringer of news, etc" .)

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

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