So thick-headed, this boozer? (3)

I believe the answer is:

sot

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'this boozer?' is the definition.
(thesaurus)

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

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.

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