Flyer left ale - getting drunk! (7)
I believe the answer is:
leaflet
'flyer' is the definition.
(thesaurus)
'left ale getting drunk' is the wordplay.
'getting drunk' indicates an anagram.
'left'+'ale'='leftale'
'leftale' is an anagram of 'LEAFLET'.
(Other definitions for leaflet that I've seen before include "It may advertise" , "Distribute information" , "All feet (anag)" , "Small information sheet" , "Bill, pamphlet" .)