Car luggage space (4)
I believe the answer is:
boot
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">car luggage space</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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" .)