Be hanged (5)
I believe the answer is:
swing
'be hanged' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for swing that I've seen before include "Jaunty rhythm in music" , "Be lively; be hung" , "Type of big-band jazz" , "Sway to and fro" , "Golfer may want to perfect this" .)