Newly developed medicine I dismissed is common throughout area (7)
I believe the answer is:
endemic
'common throughout area' is the definition.
(as in endemic wildlife)
'newly developed medicine i dismissed' is the wordplay.
'newly developed' indicates anagramming the letters.
'dismissed' indicates named letters should be taken away.
'medicine' with 'i' taken away is 'medcine'.
'medcine' with letters rearranged gives 'ENDEMIC'.
'is' is the link.
(Other definitions for endemic that I've seen before include "(Of a disease) prevalent in a group or area" , "Disease found locally" , "in the vicinity" , "Confined to (disease)" , "Native to a certain area" .)