Make a reservation (4)
I believe the answer is:
book
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">make a reservation</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for book that I've seen before include "Written work; reserve" , "Reserve - volume" , "See 1 ac" , "Strict rules" , "Quick work" .)