San Antonio mission (5)
I believe the answer is:
alamo
'san antonio mission' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for alamo that I've seen before include "Site of a Texas siege, 1836" , "Texas fort, scene of famous siege by Mexican army" , "1836 massacre at a San Antonio, Texas mission" , "Mexicans invested in Texas" , "Historic Texas mission station" .)