Out of this world dance move (8)
I believe the answer is:
moonwalk
This might be a double definition.
'out of this world dance' is the first definition.
'moonwalk' can be an answer for 'dance' (I've seen this before). I'm not certain of the 'out of this world' bit.
'move' is the second definition.
(moonwalk is a kind of move)
(Other definitions for moonwalk that I've seen before include "Lunar stroll - disco manoeuvre" , "Michael Jackson dance step" , "Dance imitating astronauts" , "Dance performed by Michael Jackson" , "Jacko routine" .)