Symbol on the Texas state flag (4)
I believe the answer is:
star
'symbol on the texas state flag' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for star that I've seen before include "Point of light in the heavens" , "White blaze on a horse's forehead" , "Eg, Betelgeuse" , "Rush" , "Astronomer - dreamer" .)