… which helps heel get into Oxford, perhaps (8)
I believe the answer is:
shoehorn
'which helps heel get' is the definition.
I can't tell whether this defines the answer.
'oxford perhaps' is the wordplay.
'oxford' becomes 'shoe' (I've seen this in another clue).
'perhaps' becomes 'horn' (I can't explain this - if you can you should believe this answer much more).
'shoe'+'horn'='SHOEHORN'
'into' is the link.
(Other definitions for shoehorn that I've seen before include "Force (in Oxford?)" , "Force into an inadequate space" , "Aid to putting on footwear" , "A fitting device" , "It facilitates getting foot into footwear" .)