The sound outer parts of a banana (3)

I believe the answer is:

baa

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'the sound' is the definition.
(baa is a kind of sound)

I don't understand the rest of the clue.

(Other definitions for baa that I've seen before include "How one of the fold may sound" , "Sheep's bleat" , "Sound of sheep" , "Sound of a lamb" , "not quite consistent set of good A-level results?" .)

I've seen this clue in the Evening Standard.

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