Schooled regularly in Oxford? (4)
I believe the answer is:
shoe
'oxford?' is the definition.
(oxford is a kind of shoe)
'schooled regularly' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternating letters of 'schooled' are 'SHOE'.
'in' is the link.
(Other definitions for shoe that I've seen before include "What one needs for a horse" , "Foot-covering" , "Slingback, for example" , "Trainer maybe" , "trainer, for example" .)