Song about Uncle Sam getting drunk (8)
I believe the answer is:
carousal
'drunk' is the definition.
(thesaurus)
'song about uncle sam' is the wordplay.
'song' becomes 'carol' (carol is a kind of song).
'about' indicates putting letters inside.
'uncle sam' becomes 'usa'.
'carol' going around 'usa' is 'CAROUSAL'.
'getting' is the link.
(Other definitions for carousal that I've seen before include "rave" , "revelry" , "Bacchanal" , "Merry drinking spree" , "Merry drinking party" .)