Superficial or too easily achieved (6)
I believe the answer is:
facile
'superficial or too easily achieved' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for facile that I've seen before include "Easily achieved but of little value" , "Arrived at without due care or effort" , "Easy to accomplish" , "A piece of cake" , "Easy but glib" .)