A mouth organ (6)

I believe the answer is:

tongue

This clue is a double definition.

'a mouth' is the first definition.
(thesaurus)

'organ' is the second definition.
(I know that tongue is a organ)

(Other definitions for tongue that I've seen before include "They are hard to say" , "Part of body - language!" , "spit" , "cold meat?" , "dialect" .)

I've seen this clue in The Globe and Mail.

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