Pack carrier (4)

I believe the answer is:

mule

'pack carrier' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for mule that I've seen before include "Drug courier; animal" , "Drug smuggler" , "Proverbially stubborn animal" , "Proverbially stubborn beast" , "Equine hybrid" .)

I've seen this clue in The Wall Street Journal.

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