Absorbent paper (6)
I believe the answer is:
tissue
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">absorbent paper</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 tissue that I've seen before include "Basic structural element of an animal or plant" , "Fine weave" , "Suddenly leave in protest" , "Disposable hankie" , "Delicate fabric" .)