Drinking makes him so thick-headed! (3)

I believe the answer is:

sot

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'drinking makes him' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'so thick-headed' is the wordplay.
'thick-headed' becomes 't' (this could be a standard abbreviation I've not previously seen).
'so'+'t'='SOT'

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

I've seen this clue in the Evening Standard.

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