Soak (up), as gravy (3)
I believe the answer is:
sop
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">soak up as gravy</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sop that I've seen before include "Concession given to mollify or placate" , "Bread dipped in gravy" , "usual way of doing things, initially" , "Concession of philosophy" , "A concession or bribe, once offered to Cerberus" .)