Bald Cockney lacks any manners (4)
I believe the answer is:
airs
'manners' is the definition.
(air is a kind of manner)
I can't explain the rest of the clue.
(Other definitions for airs that I've seen before include "Melodies or artificial manners" , "Ventilates or tunes" , "- - and graces" , "Tunes and affectations" , "Broadcasts" .)