Boozer in Thurso troublesome (3)

I believe the answer is:

sot

'boozer' is the definition.
(I've seen this in another clue)

'in thurso troublesome' is the wordplay.
'in' indicates the answer is hidden within the clue.
'SOT' can be found hidden inside 'thurso troublesome'.

(Other definitions for sot that I've seen before include "Toper" , "drunk" , "Boozer" , "Lush" , "One's often intoxicated" .)

I've seen this clue in The Sun.

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