Campus courtyard (4)
I believe the answer is:
quad
'campus courtyard' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for quad that I've seen before include "One of four children born at one birth" , "Sort of bike" , "One of four in litter" , "Four-sided courtyard" , "Rectangular area with buildings on all sides" .)