Absorb, with "up" (3)
I believe the answer is:
sop
'absorb with up' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sop that I've seen before include "Piece of bread dipped in liquid, or a concession" , "Concession made to pacify troublesome person" , "A bribe or appeasement" , "Propitiatory gift" , "A concession or bribe, once offered to Cerberus" .)