Dull way to learn to accept superior path (5)
I believe the answer is:
route
'path' is the definition.
(I know that path can be written as route)
'dull way to learn to accept superior' is the wordplay.
'dull way to learn' becomes 'rote' (I've seen this in another clue).
'to accept' indicates putting letters inside.
'superior' becomes 'U' (U can mean upper-class, as in U and non-U speech).
'rote' enclosing 'u' is 'ROUTE'.
(Other definitions for route that I've seen before include "Path taken" , "Course to destination" , "Direction taken" , "Course of journey" , "Way to travel" .)