Christmas decoration from Oxford Street in Selfridges (6)
I believe the answer is:
tinsel
'christmas decoration' is the definition.
(tinsel is strewn around at Christmas)
'from oxford street in selfridges' is the wordplay.
'from' indicates the answer is hidden within the clue.
'TINSEL' is hidden in the letters of 'oxford street in selfridges'.
(Other definitions for tinsel that I've seen before include "Shiny decoration" , "Listen (anag) - yarn interwoven with glitter" , "Christmas decorations" , "Glittering metallic substance in strips or threads" , "Gaudy decoration" .)