Vain and lazy (4)
I believe the answer is:
idle
I believe this is a double definition.
'vain' is the first definition.
(I've seen this in another clue)
'lazy' is the second definition.
(similar in meaning)
'and' is the link.
(Other definitions for idle that I've seen before include "Maybe Eric" , "Member of comedy team" , "Monty Python's Eric, b. 1943" , "Tick over like engine" , "Fruitless" .)