Crossword Genius

Artificial organ composer Tees heard (5,3)

Ross

I believe the answer is:

glass eye

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'artificial organ' is the definition.
(I've seen this before)

'composer tees heard' is the wordplay.
'composer' becomes 'glass' (I can't explain this - if you can you should give a lot more credence to this answer).
'tees' becomes 'I' (where the crossword setter is 'Tees').
'heard' shows a homophone (sound like).
'i' is a homophone of 'eye'.
'glass'+'eye'='GLASS EYE'

Can you help me to learn more?

(Other definitions for glass eye that I've seen before include "no real looker?" , "Ocular prosthetic" , "Artificial organ" , "False socket filler" , "Optical replacement" .)

I've seen this clue in The Independent.
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