The —, Texan mission; site of an 1836 siege by Mexican forces (5)

I believe the answer is:

alamo

(Other definitions for alamo that I've seen before include "1836 massacre at a San Antonio, Texas mission" , "Famous battle site in Texas" , "The red planet" , "Famous Texan mission" , "The answer is a place of siege" .)

I've seen this clue in The Mirror.

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