Is she relatively hospitalised? (6)
I believe the answer is:
sister
'relatively hospitalised?' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs sometimes define each other.
'is she' is the wordplay.
I cannot quite see how this works, but
'is' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for sister that I've seen before include "A relative to resist" , "of the same origin" , "Tender" , "The nurse in charge" , "Resits (anag.)" .)