Depraved graduate ends day in place where medical treatment's provided (7)

I believe the answer is:

sickbay

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'place where medical treatment's provided' is the definition.
I can't judge whether this definition defines the answer.

'depraved graduate ends day' is the wordplay.
'depraved' becomes 'sick' (I can't justify this - if you can you should believe this answer much more).
'graduate' becomes 'BA' (someone with a Bachelor of Arts degree).
'ends' says to take the final letters.
The last letter of 'day' is 'y'.
'sick'+'ba'+'y'='SICKBAY'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for sickbay that I've seen before include "Room for ill people" , "room for improvement" .)

I've seen this clue in The Irish Times.

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