Crossword Genius

Possibly eye Bach’s expertise? (5)

Ross

I believe the answer is:

organ

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'possibly eye' is the definition.
(I know that eye is a type of sensory receptor)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for organ that I've seen before include "Ear, perhaps" , "Possibly the heart" , "Body part - wind instrument" , "Biological functionary" , "Perhaps one that's stopped" .)

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