Mouthpiece for wheelwrights? (9)

I believe the answer is:

spokesman

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'mouthpiece' is the definition.
(spokesman is a kind of mouthpiece)

I don't understand how the rest of the clue works.

(Other definitions for spokesman that I've seen before include "Group's representative" , "One speaking for others" , "One who speaks for others" , "One who makes statements for others" , "Official mouthpiece" .)

I've seen this clue in The Daily Express.

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