Medical person in Indochina (3)

I believe the answer is:

doc

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

'medical' is the definition.
(thesaurus)

'person in indochina' is the wordplay.
'DOC' is hidden in amongst the letters.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for doc that I've seen before include "Medical practitioner (abbr)" , "Medic (colloq.)" , "scaled-down version of GP" , "GP (colloq.)" , "Main dish" .)

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