Crossword Genius

Hot cocoa serving (3)

Ross

I believe the answer is:

mug

(Other definitions for mug that I've seen before include "Sucker - drinking vessel" , "Drinking vessel or foolish fellow" , "Drinking vessel for a chump" , "Drinking vessel; rob" , "Drinking vessel for one easily deceived" .)

I've seen this clue in The Wall Street Journal.
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