Sinead O'Connor's heart surgeon (3)

I believe the answer is:

doc

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

'heart surgeon' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'sinead o'connor's' is the wordplay.
'DOC' is hidden within the letters.
However, I'm unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for doc that I've seen before include "Quack" , "Disney dwarf" , "Holliday (in 17 24)" , "Consultant" , "Medic (colloq.)" .)

I've seen this clue in The Sun.

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