Grid (6)
I believe the answer is:
grille
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">grid</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for grille that I've seen before include "Part of an air-cooling system" , "Metal lattice-work" , "Metal lattice" , "Partition" , "Frame of bars" .)