Crossword Genius

Nothing is mutable in these organs (7)

Ross

I believe the answer is:

ovaries

'these organs' is the definition.
(ovary is a kind of organ)

'nothing is mutable' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'is mutable' becomes 'varies' (something which varies is mutable or changing).
'o'+'varies'='OVARIES'

'in' is the link.

(Other definitions for ovaries that I've seen before include "Egg-producing organs in female animals" , "egg production unit" .)

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