Sozzled patron eating potato swollen? (11)
I believe the answer is:
protuberant
'swollen?' is the definition.
(thesaurus)
'sozzled patron eating potato' is the wordplay.
'sozzled' indicates an anagram.
'eating' is an insertion indicator.
'potato' becomes 'tuber' (potato is an example of a tuber).
'patron' is an anagram of 'proant'.
'proant' placed around 'tuber' is 'PROTUBERANT'.
(Other definitions for protuberant that I've seen before include "Sticking out" , "Bulging" , "Proud" , "Outstanding" .)