Crossword Genius

Argument for turning hospital into a new, mature home (9)

Ross

I believe the answer is:

orphanage

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

'home' is the definition.
(I've seen this before)

'argument for turning hospital into a new mature' is the wordplay.
I cannot quite see how this works, but
'hospital' could be 'h' (abbreviation for hospital) and 'h' is found within the answer.
'a' could be 'an' and 'an' is found within the answer.
'mature' could be 'age' (synonyms) and 'age' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for orphanage that I've seen before include "Parentless children's institution" , "building" , "with deprived children" , "Children's home" , "left children here?" .)

I've seen this clue in the Sydney Morning Herald.
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