Medico from Indochina (3)
I believe the answer is:
doc
'medico' is the definition.
(synonyms)
'from indochina' is the wordplay.
'from' says the answer is hidden in the clue.
'DOC' is hidden within 'indochina'.
(Other definitions for doc that I've seen before include "Holliday (in 17 24)" , "bones" , "Consultant" , "Quack" , "Medical practitioner (abbr)" .)