Mission appears in article by the French medic (5)
I believe the answer is:
alamo
'mission' is the definition.
(famous mission and siege from the Texas revolution)
'article by the french medic' is the wordplay.
'article' becomes 'a' (indefinite article).
'by' means one lot of letters go next to another.
'the french' becomes 'la'.
'medic' becomes 'mo' (medical officer).
'a'+'la'+'mo'='ALAMO'
'appears in' is the link.
(Other definitions for alamo that I've seen before include "Texas mission besieged and captured by Mexican forces in 1836" , "Famous Texan fortress" , "Where Davy Crockett died, 1836" , "national monument" , "ill-fated mission" .)