Crossword Genius

Lying down having lost right organ

Ross

I believe the answer is:

prostate

I'm a little stuck... Click here to teach me more about this clue!

'organ' is the definition.
(prostate is a kind of organ)

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

Can you help me to learn more?

(Another definition for prostate that I've seen is " A protest about a troublesome male gland".)

I've seen this clue in The Telegraph.
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