As indicated above, the clog is probably in the trap. If a plunger doesn't work then taking off the trap and dunking the icky mess in a bucket will do the trick.
There's also a tool on the market specifically for breaking up trap clogs. It's a flexible plastic strip with some ridges on the sides. It may be called a "Zip-Stick" but I'm not sure. I have one somewhere but since I learned to put my thumb over the vent when plunging the bathroom sink, I haven't used it.
Good luck!
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