Prepare for a vacation (4)
I believe the answer is:
pack
'prepare for a vacation' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pack that I've seen before include "Put clothes etc into suitcase" , "Group of scouts" , "Members of rugby scrum" , "Fill luggage - wolves" , "Fill (a suitcase)" .)