Type of shoe in box, for display (6)
I believe the answer is:
oxford
'type of shoe' is the definition.
(I know that oxford is a type of shoe)
'in box for display' is the wordplay.
'in' indicates the answer is hidden within the clue.
'OXFORD' can be found hidden inside 'box for display'.
(Other definitions for oxford that I've seen before include "University - shoe" , "Dark blue university?" , "Material used in shirt" , "Boat Race's Dark Blues" , "English university on Thames" .)