Nurse Grey is involved with our hospital procedure (12)

I believe the answer is:

neurosurgery

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'hospital procedure' is the definition.
The definition suggests a singular noun which matches the answer.

'nurse grey is involved with our' is the wordplay.
'is involved with' indicates anagramming the letters (involved can mean confusing or complex).
'nurse'+'grey'='nursegrey'
'nursegrey' anagrammed with 'our' gives 'NEUROSURGERY'.

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I've seen this clue in The Telegraph.

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