Swing duke at corner (6)
I believe the answer is:
dangle
'swing' is the definition.
(I know that swing can be written as dangle)
'duke at corner' is the wordplay.
'duke' becomes 'd' (abbreviation).
'at' means one lot of letters go next to another.
'corner' becomes 'angle' (eg a corner of a shape).
'd'+'angle'='DANGLE'
(Other definitions for dangle that I've seen before include "Hang provocatively" , "Hang loosely or swing" , "Suspend in front of Glenda" , "wave" , "Hang -- Glenda (anag)" .)