See a drunken sot's penalty (4)
I believe the answer is:
cost
'penalty' is the definition.
(I've seen this in another clue)
'see a drunken sot's' is the wordplay.
'see' becomes 'c' (the word for the letter, according to Chambers).
'a drunken' indicates anagramming the letters.
'sot' is an anagram of 'ost'.
'c'+'ost'='COST'
(Other definitions for cost that I've seen before include "Amount required as payment" , "estimate price" , "Be priced at" , "Estimate the expense of doing" , "Come to" .)