Houston university (4)
I believe the answer is:
rice
'houston university' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rice that I've seen before include "... his librettist - cereal" , "Staple food -- English lyricist, b. 1944" , "Staple cereal" , "Cultivated food grass" , "Grain from the paddy field" .)