One leaving medicine out for native (7)
I believe the answer is:
Here is my best explanation:
'native' is the definition.
('endemic' can be similar in meaning to 'native')
'one leaving medicine out' is the subsidiary indication.
'one' becomes 'i' (roman numeral).
'leaving' is a deletion indicator.
'out' is an anagram indicator.
'medicine' with 'i' removed is 'medcine'.
'medcine' anagrammed gives 'endemic'.
'for' is the link.
(Other definitions for endemic that I've seen before include "Regularly occurring, disease say", "in the vicinity", "(Of a disease) regularly found in a certain area", "Men dice in way commonly found in country or place", "restricted to a particular area", "(Of disease) regularly found in population", "Prevalent among a group of people, disease perhaps", "(Of disease) widespread in an area", "locally confined" and "(Of disease) widely found in a certain area".)