Alternative to Budget (5)
I believe the answer is:
alamo
'alternative to budget' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for alamo that I've seen before include "Where Jim Bowie died" , "Texan battle" , "Texas fort famed for defence against Mexican army" , "The answer is a place of siege" , "The red planet" .)