Car luggage space (4)
I believe the answer is:
boot
'car luggage space' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for boot that I've seen before include "Kick; start (a computer)" , "Sturdy footwear" , "They call it a trunk in the US" , "Item of footwear" , "Amass and hide away" .)