Crossword Genius

As simpleton, face attack (3)

Ross

I believe the answer is:

mug

'attack' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for mug that I've seen before include "Large drinking vessel or slang victim" , "Drinking vessel; rob" , "Drinking vessel for a chump" , "Sucker - drinking vessel" , "Gullible person" .)

I've seen this clue in The Times.
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