Flyer left ale - getting drunk! (7)
I believe the answer is:
'flyer' is the definition.
'left ale getting drunk' is the wordplay.
'getting drunk' indicates an anagram.
'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" .)