Sexless: imagine uterus partially removed (6)

I believe the answer is:

neuter

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'removed' is the definition.
Both the definition and answer are adjectives. Perhaps there's an association between them I don't understand?

'sexless imagine uterus partially' is the wordplay.
'partially' indicates a hidden word.
'NEUTER' is hidden within 'sexless imagine uterus'.

Can you help me to learn more?

(Other definitions for neuter that I've seen before include "Retune (anag.)" , "Sexless" , "Make ineffective; gender" , "Tureen (anag.)" , "Castrate" .)

I've seen this clue in The Guardian.

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