Crossword Genius

He's probably drunk, thus about finished (3)

Ross

I believe the answer is:

sot

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'he's probably drunk' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'thus about finished' is the wordplay.
'thus' becomes 'so' (synonyms).
'about finished' becomes 't' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'so'+'t'='SOT'

Can you help me to learn more?

(Other definitions for sot that I've seen before include "One drinks" , "Boozer" , "Lush" , "A chronic drinker" , "Habitual drunkard" .)

I've seen this clue in the Evening Standard.
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