Rest is arranged for important person in hospital (6)

I believe the answer is:

sister

I'm a little stuck... Click here to teach me more about this clue!

'important person in hospital' is the definition.
I can't tell whether this definition defines the answer.

'rest is arranged' is the wordplay.
'arranged' indicates anagramming the letters (letters rearranged).
'rest'+'is'='restis'
'restis' with letters rearranged gives 'SISTER'.

'for' is the link.

Can you help me to learn more?

(Other definitions for sister that I've seen before include "Senior nurse; relative" , "Relative in hospital?" , "Tender" , "Nun's title" , "woman in hospital" .)

I've seen this clue in The Guardian.

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