Unit in hospital for people with titles (8)

I believe the answer is:

baronets

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'people with titles' is the definition.
I can't tell whether this definition defines the answer.

'unit in hospital' is the wordplay.
'unit' becomes 'one' (synonyms).
'in' means one lot of letters goes inside another.
'hospital' becomes 'Barts' (short for St Bartholomew's Hospital).
'one' placed within 'barts' is 'BARONETS'.

'for' is the link.

Can you help me to learn more?

(Another definition for baronets that I've seen is " nobles".)

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