Not drunk (5)
'not drunk' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sober that I've seen before include "Temperate" , "Snot drunk" , "not moved" , "Serious, dull" , "Sensible - clear-headed" .)
(Other definitions for eaten that I've seen before include "worried" , "Got" , "courses enjoyed?" , "used for food" , "Scoffed" .)