Phillips University site (4)
I believe the answer is:
'phillips university site' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for enid that I've seen before include "& 18 Down Children's author" , "Woman" , "Writer of children's books, d. 1968" , "W - - Blyton" , "Geraint's wife's" .)