It could be an Oxford way of speaking (6)
I believe the answer is:
brogue
I believe this is a double definition.
'it could be an oxford' is the first definition.
(as in Oxford shoes)
'way of speaking' is the second definition.
(brogue can mean a regional accent)
(Other definitions for brogue that I've seen before include "afoot?" , "Patterned shoe, accent" , "What might identify an Irishman" , "Irish accent or strong shoe" , "Stout leather shoe" .)