Houston campus (4)
I believe the answer is:
rice
'houston campus' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rice that I've seen before include "Grain from the paddy field" , "Lyricist Tim - dramatist Elmer" , "... his librettist - cereal" , "Grain for food" , "Cereal grass" .)