I treat tender surgeries? (10,5)

I believe the answer is:

registered nurse

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'i' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'treat tender surgeries?' is the wordplay.
'treat' indicates anagramming the letters.
'tender'+'surgeries'='tendersurgeries'
'tendersurgeries' with letters rearranged gives 'REGISTERED NURSE'.

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I've seen this clue in The Independent.

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