Texas town (4)
'texas town' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Another definition for waco that I've seen is " Texas city linked to a 1993 siege and massacre".)
(Other definitions for austin that I've seen before include "Texan state capital" , "Capital city of Texas" , "State capital of Texas" , "US state capital - old English car manufacturer" , "The capital of Texas (6)" .)