Imperfect (6)
I believe the answer is:
flawed
'imperfect' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for flawed that I've seen before include "Containing blemish or imperfection" , "Blemished; faulty" , "wrong" , "with a hole in it" , "Having blemish or defect" .)