Small mat (7)
I believe the answer is:
coaster
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small mat</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 coaster that I've seen before include "Small ship or beer mat" , "Mat for decanter or glasses" , "Small mat; cargo ship" , "Mat to protect a table" , "It goes under a schooner, perhaps" .)