Prepare deck for dance (7)
I believe the answer is:
shuffle
This clue is a double definition.
'prepare deck' is the first definition.
(I've seen this before)
'dance' is the second definition.
(I've seen this before)
'for' acts as a link.
(Other definitions for shuffle that I've seen before include "Act evasively" , "dance" , "that dealer's used to?" , "Reorganise playing cards" , "Walk with difficulty" .)