Cases for neuroscience unit emergency room doctor (6)

I believe the answer is:

neuter

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'doctor' is the definition.
(thesaurus)

'cases for neuroscience unit emergency room' is the wordplay.
'cases for' suggests removing the centre (I've seen 'case for' mean this (the letters which encase the others are used)).
'unit' becomes 'ut' (I can't explain this - if you can you should give a lot more credence to this answer).
'emergency room' becomes 'ER' (abbreviation popularized by US TV series).
'neuroscience' with its centre taken out is 'ne'.
'ne'+'ut'+'er'='NEUTER'

Can you help me to learn more?

(Other definitions for neuter that I've seen before include "Retune (anag.)" , "Neither m nor f" , "De-sex" , "Castrate" , "Neither masculine nor feminine gender" .)

I've seen this clue in The Times.

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