Texas oil city (6)
I believe the answer is:
odessa
'texas oil city' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for odessa that I've seen before include "Port city on the Black Sea" , "Battleship Potemkin mutiny port" , "Ukrainian naval base" , "Do seas come into Ukrainian city?" , "Ukrainian location" .)