Indicate one can become a medical practitioner (9)
I believe the answer is:
dietician
'a medical practitioner' is the definition.
(I know that dietician is a type of medical practitioner)
'indicate one can' is the wordplay.
'one' becomes 'i' (Roman numeral).
'can' indicates anagramming the letters (I've seen 'canned' mean this (canned can mean drunk)).
'indicate'+'i'='indicatei'
'indicatei' with letters rearranged gives 'DIETICIAN'.
'become' is the link.
(Other definitions for dietician that I've seen before include "expert at what you should take in" , "Nutritionist" , "Food expert" .)