Crossword Genius

So thick-headed, this boozer? (3)

Ross

I believe the answer is:

sot

I'm a little stuck... Click here to teach me about this clue!

Here is my best explanation:

'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?

This clue was last seen in Evening Standard