Battle to get article by the French doctor (5)
I believe the answer is:
Here is my best explanation:
'battle' is the definition.
(famous mission and siege from the Texas revolution)
'article by the french doctor' is the subsidiary indication.
'article' becomes 'a' (example of the part-of-speech).
'by' is a charade indicator (letters next to each other).
'the french' becomes 'la'.
'doctor' becomes 'mo' (**).
'to get' is the link.
(Other definitions for alamo that I've seen before include "Where Davy Crockett met his end", "Famous battle in Texas launched by the Mexican army", "Texas fort, scene of famous siege by Mexican army", "Site of famous battle in Texas", "Fort in San Antonio, once famously besieged", "Massacre scene in Texas", "The red planet", "Texan battle", "Famous mission in Texas" and "Famous Texan fortress".)