Hang key by corner (6)
I believe the answer is:
dangle
'hang' is the definition.
(I know that dangle is a more specific form of the action suspend)
'key by corner' is the wordplay.
'key' becomes 'd' (musical key).
'by' is a charade indicator (letters next to each other).
'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" , "wave" , "Temptingly offer" , "Hang -- Glenda (anag)" .)